Pet1  —n. 1 domestic or tamed animal kept for pleasure or companionship. 2 darling, favourite. —attrib. Adj. 1 kept as a pet (pet lamb). 2 of or for pet animals (pet food). 3 often joc. Favourite or particular (pet hate). 4 expressing fondness or familiarity (pet name). —v. (-tt-) 1 fondle erotically. 2 treat as a pet; stroke, pat. [origin unknown]