The Definite Article in Welsh

In Brief

Welsh has one definite article, meaning “the”, with three forms: y before most consonants, yr before vowels and h, and 'r after a word ending in a vowel. Thus, “the dog” is y ci, “the school” is yr ysgol, and “the children are playing” is mae'r plant yn chwarae. Welsh has no ordinary equivalent of English a/an: ci can mean “a dog,” while un ci specifically means “one dog.”

Overview

A definite article is a word that marks someone or something as identifiable: English uses the in “the book” when speaker and listener know which book is meant. Welsh calls the article y fannod and writes it as y, yr, or 'r. These are not three articles with different meanings; they are three shapes of the same word.

This is an A1 foundation topic. You need the article for everyday phrases such as y tŷ (“the house”), yr ysgol (“the school”), and i'r gwaith (“to work”). Unlike English, Welsh chooses the form partly according to the sounds around it. The apostrophe form 'r also attaches visually to the preceding word.

The article has one further effect that English learners must notice early. Welsh nouns (words naming people, places, things, or ideas) have grammatical gender: they are classed as masculine or feminine. A feminine singular noun normally undergoes soft mutation after the article—a regular change to its first consonant. That is why cath (“cat”) becomes y gath (“the cat”). The beginner rules are straightforward; later sections explain the less visible cases and a few patterns found in larger noun phrases.

How It Works

Choosing between y, yr, and 'r

Start by looking at the word immediately before the article. If there is no preceding vowel-final word, look at the beginning of the word after it.

Form	Where it is used	Welsh	English
y	Before most consonants	y ci, y bws	the dog, the bus
yr	Before a vowel or h	yr ysgol, yr haf	the school, the summer
'r	After a word ending in a vowel	mae'r ci, i'r ysgol	the dog is, to the school

Use this order when deciding:

1. After a word ending in a vowel, use 'r. This rule comes first: mae'r trên (“the train is”), i'r ysbyty (“to the hospital”), o'r gwaith (“from work”), gyda'r plant (“with the children”). The next word may begin with either a consonant or a vowel.
2. Otherwise, use yr before a vowel or h: yr afon (“the river”), yr oren (“the orange”), yr heddlu (“the police”).
3. Otherwise, use y: y bachgen (“the boy”), y llyfr (“the book”), y trên (“the train”).

The apostrophe in 'r marks an omitted vowel. 'R is a normal written form, not an informal shortcut. It belongs to the preceding word with no space: mae'r, not mae 'r or mae yr.

When another word stands between the article and the noun, choose y or yr from that following word: yr hen dŷ (“the old house”) uses yr because hen begins with h.

Welsh has no indefinite article

An indefinite article is English a/an, used when a person or thing has not been identified. Welsh normally leaves the noun bare—that is, with no article.

Meaning	Welsh	What to notice
a dog	ci	no article
the dog	y ci	definite article
a school	ysgol	no article
the school	yr ysgol	yr before a vowel
one dog	un ci	un is the number “one”

Context tells you whether a bare singular noun should be translated with English “a/an.” In Mae ci yn yr ardd, the natural English translation is “There is a dog in the garden.” Welsh does not need a word before ci.

Do not automatically insert un. It adds the idea of the number one, often in contrast with another number: un ci, nid dau (“one dog, not two”). English uses “one” in the same situation.

Mutation after the article

After the definite article, a feminine singular noun normally takes soft mutation. Masculine singular nouns and plural nouns do not mutate merely because of the article.

Noun type	Basic form	With the article	English
masculine singular	ci	y ci	the dog
feminine singular	cath	y gath	the cat
feminine singular	merch	y ferch	the girl
plural	cathod	y cathod	the cats
plural	merched	y merched	the girls

The common visible soft-mutation changes are:

Basic initial	Mutated initial	Example after the article
p	b	pont → y bont (“the bridge”)
t	d	tref → y dref (“the town”)
c	g	cadair → y gadair (“the chair”)
b	f	buwch → y fuwch (“the cow”)
d	dd	dinas → y ddinas (“the city”)
g	disappears	gardd → yr ardd (“the garden”)
m	f	merch → y ferch (“the girl”)
ll	l	llaw → y law (“the hand”)
rh	r	rhan → y ran (“the part”)

The last table shows an important detail: mutation can affect which written article form appears. When feminine gardd loses its initial g, the result begins with a vowel, so “the garden” is yr ardd. It is best to learn such nouns as a pair: gardd, yr ardd.

Not every feminine noun displays a visible change. A noun beginning with a vowel, h, or a consonant not altered by soft mutation can still be feminine: afon → yr afon (“the river”). Conversely, seeing no mutation does not by itself prove that a noun is masculine.

A compact beginner rule

For your first conversations, remember four points:

• y + most consonants: y tŷ
• yr + vowel or h: yr ysgol, yr haf
• vowel-final word + 'r: mae'r, i'r, o'r
• no article for ordinary a/an: llyfr can mean “a book”

Then learn feminine nouns together with their article form: cath — y gath, cadair — y gadair.

Examples in Context

Welsh	English	Note
Mae'r plant yn chwarae.	The children are playing.	'r follows vowel-final mae.
Mae'r ci yn cysgu.	The dog is sleeping.	Masculine ci does not mutate.
Mae cath yn yr ardd.	There is a cat in the garden.	Bare cath means “a cat”; gardd becomes yr ardd.
Dw i'n darllen y llyfr.	I am reading the book.	y before a consonant.
Mae hi'n mynd i'r ysgol.	She is going to school.	'r follows the preposition i.
Maen nhw'n dod o'r gwaith.	They are coming from work.	'r follows o.
Yr haf yw fy hoff dymor.	Summer is my favourite season.	yr before h.
Mae'r gath ar y gadair.	The cat is on the chair.	Both feminine nouns show c → g.
Mae'r ferch yn byw yn y ddinas.	The girl lives in the city.	merch and dinas mutate after the article.
Ble mae'r bws?	Where is the bus?	'r after mae; masculine bws remains unchanged.
Dw i'n gweld y ci a'r gath.	I can see the dog and the cat.	The second article is 'r after a (“and”).
Mae'r llyfr yma'n ddiddorol.	This book is interesting.	y ... yma means “this ...”.

Common Mistakes

Using un as if it meant “a/an”

• Wrong: Dw i eisiau un coffi. when you simply mean “I want a coffee.”
• Right: Dw i eisiau coffi.
• Why: Welsh has no indefinite article. Un means “one” and should be used when the number is relevant. Depending on context, Welsh may also treat substances such as coffee as a bare mass noun.

Using y before every word

• Wrong: y ysgol, y haf
• Right: yr ysgol, yr haf
• Why: Use yr before a vowel or h, unless the preceding word requires 'r.

Looking only at the next word and missing 'r

• Wrong: Mae y ci yma.
• Right: Mae'r ci yma.
• Why: After vowel-final mae, the article is 'r, even though ci begins with a consonant.

Adding a space before 'r

• Wrong: i 'r siop, mae 'r plant
• Right: i'r siop, mae'r plant
• Why: Attach 'r directly to the preceding word.

Forgetting feminine singular mutation

• Wrong: y cath, y merch, y dinas
• Right: y gath, y ferch, y ddinas
• Why: A feminine singular noun normally undergoes soft mutation after the article. Learn a noun's gender and article phrase together.

Mutating every noun after the article

• Wrong: y gi for “the dog,” y gathod for “the cats”
• Right: y ci, y cathod
• Why: The article itself triggers this mutation only with feminine singular nouns, not masculine nouns or plurals.

Usage Notes

In speech, y, yr, and 'r are short, unstressed forms and can be easy to miss. Listening for the whole phrase is more useful than trying to hear the article in isolation. Notice recurring chunks such as mae'r, i'r, and o'r.

Welsh uses the same article for masculine, feminine, singular, and plural nouns. The article's shape does not announce gender: mutation on a following singular noun may reveal femininity, but many feminine nouns begin with sounds that show no visible change.

The definite article often appears in the useful demonstrative frames y ... yma (“this ...”) and y ... yna (“that ...”): y llyfr yma (“this book”), y tŷ yna (“that house”). Literally, the noun is framed by the article and a place word, so do not copy English order as though “this” belonged before the noun.

Beyond the Basics

You do not need to master the following patterns at A1, but recognising them will prevent confusion later.

Definite possession phrases

Welsh commonly places the possessor after the thing possessed, without putting an article before the first noun:

• drws y tŷ — “the door of the house”
• enw'r ysgol — “the name of the school”
• car Dafydd — “Dafydd's car”

In drws y tŷ, the definiteness of y tŷ makes the whole phrase identifiable. English begins with “the door,” but Welsh does not say y drws y tŷ for this ordinary possessive structure. This is a broader feature of Welsh noun phrases, not an exception to memorise for every A1 sentence.

Mutation can hide the noun's dictionary form

A dictionary lists gardd, gwraig, or llaw, but a text may show yr ardd, y wraig, or y law. When looking up an unfamiliar word after the article, mentally reverse a possible soft mutation. This becomes especially useful once you read longer texts.

The article and adjectives

An adjective usually follows its noun in Welsh: y llyfr coch (“the red book”). Feminine singular noun phrases may contain more than one mutation rule: the noun can mutate after the article, and an adjective after a feminine singular noun can also mutate. For example, cath fach means “a small cat,” and y gath fach means “the small cat.” Treat adjective agreement as its own topic; for now, notice that the first change in y gath comes from the article plus a feminine singular noun.

Some common adjectives come before the noun. The article form then reflects the immediately following word, as in yr hen dŷ (“the old house”). Such phrases are worth learning whole rather than forcing them into English word order.

Practice Tips

1. Make three sound-based lists. Put new phrases under y, yr, or 'r: y bws, yr orsaf, i'r orsaf. Say the complete phrase aloud rather than memorising the article alone.
2. Record gender with the noun. Write cath (f), y gath and ci (m), y ci on vocabulary cards. The contrast trains both gender and mutation without requiring a separate rule check each time.
3. Translate in both directions. Contrast “a book / the book / one book” as llyfr / y llyfr / un llyfr. Then repeat with nouns beginning in a vowel and with feminine nouns that mutate.

Related Concepts

• Next step: Gender of Nouns — explains how masculine and feminine classification affects article mutation and other parts of Welsh grammar.