n. [capitalized] In herpetology, a genus of very large non-venomous serpents, of the family Boidæ, notable for their power of constriction.n. In ordinary language, some large serpent, as a boa-constrictor, anaconda, or python; any member of the family Boidæ or Pythonidæ.n. A long and slender cylindrical wrap of fur, worn by women round the neck.