déis

Old Irish

From Proto-Celtic *damstis, from Proto-Indo-European *dṃ-sth₂-is (literally “house-staying”), from *dṓm (“home, house”).^[1]

déis f (genitive désa, nominative plural déisi)

Feminine i-stem
	Singular	Dual	Plural
Nominative	déis	déis^L	déisi^H
Vocative	déis	déis^L	déisi^H
Accusative	déis^N	déis^L	déisi^H
Genitive	déso^H, désa^H	déso^H, désa^H	déise^N
Dative	déis^L	déisib	déisib
Initial mutations of a following adjective: ^H = triggers aspiration ^L = triggers lenition ^N = triggers nasalization

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

^ Weiss, Michael (2017 September 26) “The paradigm of the word for ‘house, home’ in Old Irish and related issues”, in Indogermanische Forschungen, volume 122, number 1, Walter de Gruyter GmbH, →DOI, →ISSN, pages 61–82