from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Any of several venomous Old World snakes of the family Viperidae, having a single pair of long, hollow fangs and a thick, heavy body. Also called adder2.
- n. A pit viper.
- n. A venomous or supposedly venomous snake.
- n. A person regarded as malicious or treacherous.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A poisonous snake in the family Viperidae.
from the GNU version of the Collaborative International Dictionary of English
- n. Any one of numerous species of Old World venomous snakes belonging to Vipera, Clotho, Daboia, and other genera of the family Viperidæ.
- n. A dangerous, treacherous, or malignant person.
- n. Loosely, any venomous or presumed venomous snake.
from The Century Dictionary and Cyclopedia
- n. A venomous snake of the family Viperidæ: originally and especially applied to the only serpent of this kind occurring in the greater part of Europe, Vipera communis Or Pelias beruts.
- n. Any venomous serpent except a rattlesnake; a viperine; a cobriform and not crotali form serpent, as a cobra, asp, or adder; also, loosely, any serpent that is venomous, or supposed to be so; a dangerous, repulsive, or ugly snake.
- n. In heraldry, a serpent used as a bearing, some writers avoid the word serpent and use viper instead, there being no difference in the representations.
- n. One who or that which is mischievous or malignant.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. venomous Old World snakes characterized by hollow venom-conducting fangs in the upper jaw
Middle English vipere, from Old French, from Latin vīpera, snake, contraction of *vīvipera : vīvus, alive; see gwei- in Indo-European roots + parere, to give birth; see perə-1 in Indo-European roots.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin vīpera. (Wiktionary)