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Tangent in Irish (Tadhlaí): Meaning, Pronunciation, Usage

The Irish for tangent is tadhlaí, a masculine noun (plural tadhlaithe).
Updated October 2026Report a mistake

How to say “tangent” in Irish

Irish:
tadhlaí
English:
tangent
Word type:
noun
Gender:
masculine, fourth declension
Pronunciation:
“TYE-lee”  /ˈt̪ˠəilʲiː/
Various forms
Plural:
tadhlaithe (tangents)
Genitive singular:
tadhlaí, an tadhlaí (e.g. fad an tadhlaí, length of the tangent)
Genitive plural:
tadhlaithe, na dtadhlaithe (e.g. airíonna na dtadhlaithe, the properties of the tangents)

What does “tadhlaí” mean?

tangent
In geometry, a straight line that touches a curve at one point without crossing it; also the trigonometric ratio of that name.Also: tangent line, tan.

“Tadhlaí” with the article

The plural of tangent in Irish is tadhlaithe. Here is tadhlaí after the article (an t-alt), in the singular and the plural.

an tadhlaí
the tangent
No change after an
na tadhlaithe
the tangents
Plural: no change after na

“Tadhlaí” in a sentence: Irish examples

Common Irish sentences using tadhlaí, the Irish word for tangent.

Tarraing tadhlaí leis an gciorcal ag an bpointe sin.
Draw a tangent to the circle at that point.
Teagmhaíonn an tadhlaí leis an gciorcal in aon phointe amháin.
The tangent touches the circle at only one point.
Faigh fána an tadhlaí ag x cothrom le dó.
Find the slope of the tangent at x equals two.
Tá dhá thadhlaí le tarraingt ón bpointe seachtrach.
Two tangents are to be drawn from the external point.
Bhí botún i mo thadhlaí sa scrúdú.
There was a mistake in my tangent in the exam.
Tá na tadhlaithe ingearach leis an nga.
The tangents are perpendicular to the radius.
Cuir an luach sin isteach san fheidhm tadhlaí.
Put that value into the tangent function.

Other nouns in Irish

More everyday Irish nouns to learn next.

Tangent in Irish: frequently asked questions

What is the Irish for tangent?

The Irish for tangent is tadhlaí (pronounced “TYE-lee”). It’s a masculine noun and the plural is tadhlaithe.

How do you pronounce tadhlaí in Irish?

Tadhlaí is said like “TYE-lee” (IPA /ˈt̪ˠəilʲiː/).

What is the plural of tangent in Irish?

The plural of tadhlaí is tadhlaithe; with the article, na tadhlaithe means “the tangents”. The genitive plural is tadhlaithe, as in airíonna na dtadhlaithe (the properties of the tangents).

Why does tadhlaí change to thadhlaí or dtadhlaí?

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

How do I say 'go off on a tangent' in Irish?

'Tadhlaí' is used only in mathematics; for digressing say 'imeacht ó ábhar' or 'dul ar seachrán ón scéal'.

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