trén

See also: tren, trèn, and trên

Old Irish

From Proto-Celtic *trexsnos (compare Primitive Irish ᚈᚈᚏᚓᚅᚐᚂᚒᚌᚑᚄ (ttrenalugos), ᚈᚏᚓᚅᚐᚌᚒᚄᚒ (trenagusu)), with comparative *trexsos (compare Middle Welsh trech (“stronger”); Breton trec'h (“victory”); Cornish trygh (“victorious”)); Gaulish Trexius, Trexa, Trenus), from Proto-Indo-European *(s)treg- (“to be stiff, rigid, strong”) (Old Norse þróttr (“strength”))

trén (equative tressithir, comparative tressa, superlative tressam)

o/ā-stem
Singular	Masculine	Feminine	Neuter
Nominative	trén	trén	trén
Vocative	tréuin* trén**	trén
Accusative	trén	tréuin
Genitive	tréuin	tréuine	tréuin
Dative	trén	tréuin	trén
Plural	Masculine	Feminine/neuter
Nominative	tréuin	tréna
Vocative	trénu tréna†
Accusative	trénu tréna†
Genitive	trén
Dative	trénaib
Notes	modifying a noun whose vocative is different from its nominative *modifying a noun whose vocative is identical to its nominative † not when substantivized

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