from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. One that adds, especially a computational device that performs arithmetic addition.
  • n. See viper.
  • n. Any of several nonvenomous snakes, such as the milk snake of North America, popularly believed to be harmful.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A snake.
  • n. A name loosely applied to various snakes more or less resembling the viper; a viper.
  • n. A small venomous serpent of the genus Vipera. The common European adder is the Vipera berus. The puff adders of Africa are species of the genus Oecobius.
  • n. Any of several small nonvenomous snakes resembling the adder, such as the milk snake.
  • n. The sea-stickleback or adder-fish.
  • n. Someone who or something which performs arithmetic addition.
  • n. Something which adds or increases.

from the GNU version of the Collaborative International Dictionary of English

  • n. One who, or that which, adds; esp., a machine for adding numbers.
  • n. A serpent.
  • n.
  • n. A small venomous serpent of the genus Vipera. The common European adder is the Vipera berus or Pelias berus. The puff adders of Africa are species of Clotho.
  • n. In America, the term is commonly applied to several harmless snakes, as the milk adder, puffing adder, etc.
  • n. Same as Sea Adder.

from The Century Dictionary and Cyclopedia

  • n. 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.
  • n. A name loosely applied to various snakes more or less resembling the viper, Pelias berus: as
  • n. The sea-stickleback or adder-fish. See adder-fish.
  • n. One who adds.
  • n. An instrument for performing addition.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a machine that adds numbers
  • n. a person who adds numbers
  • n. small terrestrial viper common in northern Eurasia


Middle English, from an addre, alteration of a naddre, a snake, from Old English nǣdre, snake.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Middle English addere, misdivision of naddere, from Old English nǣdre, nǣddre ("snake, serpent, viper, adder"), from Proto-Germanic *nēdrōn, *nadrōn (“snake, viper”) (compare West Frisian njirre, Dutch adder, German Natter, Otter), from pre-Germanic *néh₁treh₂, variant of Proto-Indo-European *nh₁trih₂ (compare Welsh neidr, Latin natrīx ‘watersnake’), from *sneh₁- (“to spin, twist”) (compare Dutch naaien). More at needle. (Wiktionary)
to add + -er. (Wiktionary)


  • The puff adder is a short, thick viper that is responsible for more bites than any other serpent in Africa.

    Puff This!

  • (Then tell LiveJournal that their link adder is borked.)

    Go read

  • Ok.. my tag adder is updated for the restyled BlogThis!

    Blogger Blogthis! Upgrade - Freshblog

  • I just added support for Blog This! in my tag adder user script.

    Blogger Blogthis! Upgrade - Freshblog

  • 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.

    The Girl from the Marsh Croft

  • The word adder occurs five times in the text of the Authorized

    Smith's Bible Dictionary

  • 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?

  • 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.

    Of Savage Beasts and Vermin. Chapter XIV. [1577, Book III., Chapters 7 and 12; 1587, Book III., Chapters 4 and 6

  • 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.

    In the Wilds of Africa

  • This means that a simple "adder", a logic array that adds two integers together, will no longer have just the logic needed to perform the addition, but a significant amount of additional logic to perform a simultaneous ECC for the entire operation.

    More on Moore's Law


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  • "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