frithuillinn

Irish

Etymology

From frith- (“anti-, counter-”) +‎ uillinn (“angle”).

Noun

frithuillinn f (genitive singular frithuillinne, nominative plural frithuillinneacha)

1. (mathematics) return angle

Declension

Declension of frithuillinn

Second declension

Bare forms Case Singular Plural Nominative frithuillinn frithuillinneacha Vocative a fhrithuillinn a fhrithuillinneacha Genitive frithuillinne frithuillinneacha Dative frithuillinn frithuillinneacha

Forms with the definite article Case Singular Plural Nominative an fhrithuillinn na frithuillinneacha Genitive na frithuillinne na bhfrithuillinneacha Dative leis an bhfrithuillinn don fhrithuillinn leis na frithuillinneacha

Mutation

Irish mutation
Radical	Lenition	Eclipsis
frithuillinn	fhrithuillinn	bhfrithuillinn
Note: Some of these forms may be hypothetical. Not every possible mutated form of every word actually occurs.

Further reading

• Ó Dónaill, Niall (1977) “frithuillinn”, in Foclóir Gaeilge–Béarla, Dublin: An Gúm, →ISBN
• de Bhaldraithe, Tomás (1959) “frithuillinn”, in English-Irish Dictionary, An Gúm