Definitions
from The Century Dictionary.
- noun The popular English name of the viper, Vipera communis, now Pelias berus, a common venomous serpent of Europe (and the only poisonous British reptile), belonging to the family Viperidæ, of the suborder Solenoglypha, of the order Ophidia.
- noun A name loosely applied to various snakes more or less resembling the viper, Pelias berus: as
- noun The sea-stickleback or adder-fish. See
adder-fish . - noun One who adds.
- noun An instrument for performing addition.
from the GNU version of the Collaborative International Dictionary of English.
- noun One who, or that which, adds; esp., a machine for adding numbers.
- noun obsolete A serpent.
- noun A small venomous serpent of the genus Vipera. The common European adder is the
Vipera berus orPelias berus . The puff adders of Africa are species of Clotho. - noun In America, the term is commonly applied to several harmless snakes, as the
milk adder ,puffing adder , etc. - noun Same as
Sea Adder .
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun Someone who or something which performs
arithmetic addition . - noun Something which
adds orincreases . - noun obsolete A
snake . - noun A name loosely applied to various snakes more or less resembling the
viper ; a viper. - noun chiefly UK A small venomous
serpent of the genus Vipera. The common European adder is the Vipera berus. Thepuff adders of Africa are species of the genus Oecobius. - noun US, Canada Any of several small nonvenomous snakes resembling the adder, such as the milk snake.
- noun The sea-stickleback or adder-fish.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun a machine that adds numbers
- noun a person who adds numbers
- noun small terrestrial viper common in northern Eurasia
Etymologies
from Wiktionary, Creative Commons Attribution/Share-Alike License
from Wiktionary, Creative Commons Attribution/Share-Alike License
Support

Help support Wordnik (and make this page ad-free) by adopting the word adder.
Examples
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(Then tell LiveJournal that their link adder is borked.)
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The puff adder is a short, thick viper that is responsible for more bites than any other serpent in Africa.
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I just added support for Blog This! in my tag adder user script.
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Ok.. my tag adder is updated for the restyled BlogThis!
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One of them played with a litter of young hares; another ran a race with some young crows, which had hopped from their nest before they were really ready; a third caught up an adder from the ground and wound it around his neck and arm.
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The word adder occurs five times in the text of the Authorized
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Add-er-all makes you a human calculator; "addict" is in there, also "adder" -- you become a regular viper . . . anyway, it sounds like bipolar people's description of mania.
Are you taking drugs to enhance your intellectual performance?
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So soon therefore as they saw my face they ran again into the mouth of their dam, whom I killed, and then found each of them shrouded in a distinct cell or pannicle in her belly, much like unto a soft white jelly, which maketh me to be of the opinion that our adder is the viper indeed.
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So soon therefore as they saw my face they ran again into the mouth of their dam, whom I killed, and then found each of them shrouded in a distinct cell or pannicle in her belly, much like unto a soft white jelly, which maketh me to be of the opinion that our adder is the viper indeed.
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As I brought it into the light, I saw that it was a black variety of the puff adder, which is among the most poisonous serpents of Africa.
knitandpurl commented on the word adder
"With adder, the 'n-swapping' went the other way round. Old English a nadder became an adder."
-By Hook or By Crook by David Crystal, p 93
December 15, 2008