triantánacht

Irish

Etymology

From triantán (“triangle”) +‎ -acht.

Noun

triantánacht f (genitive singular triantánachta)

1. (mathematics) trigonometry

Declension

Declension of triantánacht

Third declension

Bare forms (no plural for this noun): 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

Irish mutation
Radical	Lenition	Eclipsis
triantánacht	thriantánacht	dtriantánacht
Note: Some of these forms may be hypothetical. Not every possible mutated form of every word actually occurs.

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