triantánacht

Irish

Etymology

From triantán (“triangle”) +‎ -acht.

Noun

triantánacht f (genitive singular triantánachta)

1. (mathematics) trigonometry

Declension

Declension of triantánacht (third declension, no plural)

bare forms case singular nominative triantánacht vocative a thriantánacht genitive triantánachta dative triantánacht forms with the definite article case singular nominative an triantánacht genitive na triantánachta dative leis an triantánacht don triantánacht

Derived terms

• triantánacht phlánach (“plane trigonometry”)

Related terms

• triantánúil (“trigonometrical”, adjective)

Mutation

Mutated forms of triantánacht

radical	lenition	eclipsis
triantánacht	thriantánacht	dtriantánacht

Note: Certain mutated forms of some words can never occur in standard Modern Irish.
All possible mutated forms are displayed for convenience.

Further reading

• Ó Dónaill, Niall (1977) “triantánacht”, in Foclóir Gaeilge–Béarla, Dublin: An Gúm, →ISBN
• “trigonometry”, in New English-Irish Dictionary, Foras na Gaeilge, 2013–2024