déhéidreach

Irish

Etymology

From dé- (“di-”) +‎ -héidreach (“-hedral”).

Adjective

déhéidreach (genitive singular masculine déhéidrigh, genitive singular feminine déhéidrí, plural déhéidreacha, not comparable)

1. (mathematics, aeronautics) dihedral

Declension

Declension of déhéidreach

	Singular		Plural (m/f)
Positive	Masculine	Feminine	(strong noun)	(weak noun)
Nominative	déhéidreach	dhéhéidreach	déhéidreacha; dhéhéidreacha²
Vocative	dhéhéidrigh		déhéidreacha
Genitive		déhéidrí	déhéidreacha	déhéidreach
Dative	déhéidreach; dhéhéidreach¹	dhéhéidreach; dhéhéidrigh (archaic)	déhéidreacha; dhéhéidreacha²
Comparative	níos déhéidrí
Superlative	is déhéidrí

¹ When the preceding noun is lenited and governed by the definite article.
² When the preceding noun ends in a slender consonant.

Related terms

• déhéadrán m (“dihedron”)

Mutation

Irish mutation
Radical	Lenition	Eclipsis
déhéidreach	dhéhéidreach	ndéhéidreach
Note: Some of these forms may be hypothetical. Not every possible mutated form of every word actually occurs.

Further reading

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