Webster’s Revised Unabridged Dictionary · 1913
Ophidia
O·phid′i·a (ō·fĭd′ĭ·ȧ), n. pl. [NL., fr. Gr. ὀφίδιον, dim. of ὄφις a snake.] (Zoöl.) The order of reptiles which includes the serpents.
☞ The most important divisions are: the Solenoglypha, having erectile perforated fangs, as the rattlesnake; the Proteroglypha, or elapine serpents, having permanently erect fang, as the cobra; the Asinea, or colubrine serpents, which are destitute of fangs; and the Opoterodonta, or Epanodonta, blindworms, in which the mouth is not dilatable.