the common European viper, Vipera berus.
any of various other venomous or harmless snakes resembling the viper.
How to use adder in a sentence
Many wonderful U.K. shows belong on this list ( Black adder, I, Claudius, and Prime Suspect, to name but a few).
He comes from the tribe of Dan, of which it is written: 'Dan shall be a serpent in the way, an adder in the path.'The Merrie Tales Of Jacques Tournebroche | Anatole France
Well, by and by an adder bit a knight's heel; the knight forgot all about the order, and made a slash at the adder with his sword.A Connecticut Yankee in King Arthur's Court, Complete | Mark Twain (Samuel Clemens)
Then he would suddenly turn back to Digby, but would find him poring over a book, and as dumb as an adder.Digby Heathcote | W.H.G. Kingston
At the same moment I saw a beautiful green adder come from a cleft of the mountain and crawl along the sand toward the bird.Laboulaye's Fairy Book | Various
adder drove me down, and stopped his coach at the inn, and rowed me the half-mile up.Lord Ormont and his Aminta, Complete | George Meredith
British Dictionary definitions for adder (1 of 2)
Also called: viper a common viper, Vipera berus, that is widely distributed in Europe, including Britain, and Asia and is typically dark greyish in colour with a black zigzag pattern along the back
any of various similar venomous or nonvenomous snakes
British Dictionary definitions for adder (2 of 2)
a person or thing that adds, esp a single element of an electronic computer, the function of which is to add a single digit of each of two inputs
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012