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Acute angle in Irish (Géaruillinn): Meaning, Pronunciation, Usage

The Irish for acute angle is géaruillinn, a feminine noun (plural géaruillinneacha).
Updated October 2026Report a mistake

How to say “acute angle” in Irish

Irish:
géaruillinn
English:
acute angle
Word type:
noun
Gender:
feminine
Pronunciation:
“GAYR-il-in”  /ˈɡeːɾˌɪlʲɪnʲ/
Various forms
Plural:
géaruillinneacha (acute angles)
Genitive singular:
géaruillinne, na géaruillinne (e.g. méid na géaruillinne, size of the acute angle)
Genitive plural:
géaruillinneacha, na ngéaruillinneacha (e.g. suim na ngéaruillinneacha, sum of the acute angles)

What does “géaruillinn” mean?

acute angle
An angle that is smaller than a right angle, less than 90 degrees.Also: sharp angle, angle less than 90 degrees.

“Géaruillinn” with the article

The plural of acute angle in Irish is géaruillinneacha. Here is géaruillinn after the article (an t-alt), in the singular and the plural.

an ghéaruillinn
the acute angle
Lenition: g becomes gh after an (feminine noun)
na géaruillinneacha
the acute angles
Plural: no change after na

“Géaruillinn” in a sentence: Irish examples

Common Irish sentences using géaruillinn, the Irish word for acute angle.

Is géaruillinn í an uillinn seo.
This angle is an acute angle.
Tá an ghéaruillinn níos lú ná nócha céim.
The acute angle is less than ninety degrees.
Tarraing géaruillinn i do chóipleabhar.
Draw an acute angle in your copybook.
Tá dhá ghéaruillinn sa triantán dronuilleach.
There are two acute angles in a right-angled triangle.
Tomhais méid na géaruillinne le huillinntomhas.
Measure the size of the acute angle with a protractor.
Tá trí ghéaruillinn i dtriantán comhshleasach.
An equilateral triangle has three acute angles.
D'fhoghlaimíomar faoi ghéaruillinneacha inniu.
We learned about acute angles today.

Other nouns in Irish

More everyday Irish nouns to learn next.

Acute angle in Irish: frequently asked questions

What is the Irish for acute angle?

The Irish for acute angle is géaruillinn (pronounced “GAYR-il-in”). It’s a feminine noun and the plural is géaruillinneacha.

How do you pronounce géaruillinn in Irish?

Géaruillinn is said like “GAYR-il-in” (IPA /ˈɡeːɾˌɪlʲɪnʲ/).

What is the plural of acute angle in Irish?

The plural of géaruillinn is géaruillinneacha; with the article, na géaruillinneacha means “the acute angles”. The genitive plural is géaruillinneacha, as in suim na ngéaruillinneacha (sum of the acute angles).

Why does géaruillinn change to ghéaruillinn or ngéaruillinn?

Irish changes the start of some words after certain words. After mo (my) géaruillinn becomes mo ghéaruillinn (lenition), and after ár (our) or i (in) it becomes ár ngéaruillinn (eclipsis).

What is the opposite of 'géaruillinn'?

An obtuse angle is 'maoluillinn', and a right angle is 'dronuillinn'.

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