optach

Irish

Etymology

From Medieval Latin opticus, from Ancient Greek ὀπτικός (optikós, “of seeing”). Partially calqued, substituting the native adjectival suffix -ach.

Adjective

optach (genitive singular masculine optaigh, genitive singular feminine optaí, plural optacha)

1. optic

Declension

Declension of optach

	Singular		Plural (m/f)
Positive	Masculine	Feminine	(strong noun)	(weak noun)
Nominative	optach	optach	optacha
Vocative	optaigh		optacha
Genitive		optaí	optacha	optach
Dative	optach	optach; optaigh (archaic)	optacha
Comparative	níos optaí
Superlative	is optaí

Related terms

• opta- (“opto-”)
• optaic f (“optics”)
• optúil (“optical”, adjective)

Mutation

Irish mutation
Radical	Eclipsis	with h-prothesis	with t-prothesis
optach	n-optach	hoptach	not applicable
Note: Some of these forms may be hypothetical. Not every possible mutated form of every word actually occurs.

Further reading

• Ó Dónaill, Niall (1977) “optach”, in Foclóir Gaeilge–Béarla, Dublin: An Gúm, →ISBN
• de Bhaldraithe, Tomás (1959) “optach”, in English-Irish Dictionary, An Gúm
• “optach”, in New English-Irish Dictionary, Foras na Gaeilge, 2013-2024