trīmātus — Lewis & Short
trīmātus, ūs, m.trimus,
I the age of three years (post-Aug.):
quae (gallinae) trimatum excesserunt,Col. 8, 5, 24:
a trimatu,Plin. 8, 43, 68, § 168:
in trimatu,id. 8, 50, 76, § 200; 10, 20, 22, § 44; Inscr. Orell. 4713.