HeyRua Get the app

Cosine in Irish (Comhshíneas): Meaning, Pronunciation, Usage

The Irish for cosine is comhshíneas, a masculine noun (plural comhshínis).
Updated October 2026Report a mistake

How to say “cosine” in Irish

Irish:
comhshíneas
English:
cosine
Word type:
noun
Gender:
masculine
Pronunciation:
“KOH-heen-us”  /ˈkoːhiːnʲəs/
Various forms
Plural:
comhshínis (cosines)
Genitive singular:
comhshínis, an chomhshínis (e.g. luach an chomhshínis, value of the cosine)
Genitive plural:
comhshíneas, na gcomhshíneas (e.g. tábla na gcomhshíneas, the table of the cosines)

What does “comhshíneas” mean?

cosine
In trigonometry, the ratio of the side adjacent to an acute angle to the hypotenuse in a right-angled triangle.Also: cos, trigonometric function.

“Comhshíneas” with the article

The plural of cosine in Irish is comhshínis. Here is comhshíneas after the article (an t-alt), in the singular and the plural.

an comhshíneas
the cosine
No change after an
na comhshínis
the cosines
Plural: no change after na

“Comhshíneas” in a sentence: Irish examples

Common Irish sentences using comhshíneas, the Irish word for cosine.

Ríomh comhshíneas na huillinne seo.
Calculate the cosine of this angle.
Is ionann an comhshíneas agus an taobh cóngarach thar an taobhagán.
The cosine equals the adjacent side over the hypotenuse.
Cad é luach an chomhshínis anseo?
What is the value of the cosine here?
D'fhoghlaimíomar síneas agus comhshíneas inniu.
We learned sine and cosine today.
Tá na comhshínis sin sa tábla.
Those cosines are in the table.
Bhí botún i mo chomhshíneas sa cheist.
There was a mistake in my cosine in the question.
Úsáid an cnaipe comhshínis ar an áireamhán.
Use the cosine button on the calculator.

Other nouns in Irish

More everyday Irish nouns to learn next.

Cosine in Irish: frequently asked questions

What is the Irish for cosine?

The Irish for cosine is comhshíneas (pronounced “KOH-heen-us”). It’s a masculine noun and the plural is comhshínis.

How do you pronounce comhshíneas in Irish?

Comhshíneas is said like “KOH-heen-us” (IPA /ˈkoːhiːnʲəs/).

What is the plural of cosine in Irish?

The plural of comhshíneas is comhshínis; with the article, na comhshínis means “the cosines”. The genitive plural is comhshíneas, as in tábla na gcomhshíneas (the table of the cosines).

Why does comhshíneas change to chomhshíneas or gcomhshíneas?

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

How is 'comhshíneas' related to 'síneas'?

'Comhshíneas' (cosine) is formed from 'comh-' plus 'síneas' (sine), just as English cosine comes from sine.

Learn Irish by
actually speaking it

Learn everyday Irish words like comhshíneas through guided conversation with Rua.

7-day free trial. Cancel anytime.

The HeyRua app home screen