{ ‖Vi′per‐oi″de‐a (?), Vi′per‐oi″des (?), } n. pl. [NL. See Viper, and -oid.] (Zoöl.) A division of serpents which includes the true vipers of the Old World and the rattlesnakes and moccasin snakes of America; — called also Viperina.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.