bréc

See also: brec, and brèç

Old Irish

From Proto-Celtic *brenkā, from Proto-Indo-European *bʰrenḱ- (“to deviate, corrupt”); cognate with Sanskrit भ्रंश (bhraṃśa, “deviation, decay”).^[1]

bréc f (genitive bréice, nominative plural bréca)

Feminine ā-stem
	Singular	Dual	Plural
Nominative	bréc^L	bréic^L	bréca^H
Vocative	bréc^L	bréic^L	bréca^H
Accusative	bréic^N	bréic^L	bréca^H
Genitive	bréice^H	bréc^L	bréc^N
Dative	bréic^L	brécaib	brécaib
Initial mutations of a following adjective: ^H = triggers aspiration ^L = triggers lenition ^N = triggers nasalization

Old Irish mutation
Radical	Lenition	Nasalization
bréc	bréc pronounced with /β(ʲ)-/	mbréc
Note: Some of these forms may be hypothetical. Not every possible mutated form of every word actually occurs.

^ Thurneysen, Rudolf (1940) D. A. Binchy and Osborn Bergin, transl., A Grammar of Old Irish, Dublin Institute for Advanced Studies, →ISBN, § 209, page 127; reprinted 2017 (Please provide a date or year)