trĭformis — Lewis & Short
trĭformis, e, adj.ter - forma,
Chimaera,Hor. C. 1, 27, 23:
canis,i. e. Cerberus, Sen. Herc. Oet. 1202:
Geryon,id. Agam. 841: diva, i. e. Diana, who was also Luna and Hecate, Hor. C. 3, 22, 4; called also triformis dea, Ov. M. 7, 94:
mundus, because composed of air, earth, and water,id. ib. 15, 859.