[ 'pɔ:pəs , -pɔɪs ]
■ noun a small toothed whale with a low triangular dorsal fin and a blunt rounded snout. [ Phocoena phocoena ( harbour ~ ) and other species, family Phocoenidae.]
Origin
ME: from OFr. porpois , based on L. porcus 'pig' + piscis 'fish'.