frithaire

Old Irish

frith- (“against”) +‎ aire (“guarding”).

frithaire f (genitive frithare)

Feminine iā-stem
	Singular	Dual	Plural
Nominative	frithaire^L	frithairi^L	frithairi
Vocative	frithaire^L	frithairi^L	frithairi
Accusative	frithairi^N	frithairi^L	frithairi
Genitive	frithaire	frithaire^L	frithaire^N
Dative	frithairi^L	frithairib	frithairib
Initial mutations of a following adjective: ^H = triggers aspiration ^L = triggers lenition ^N = triggers nasalization

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