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Definition adder

Etymology 1

From Middle English addere, rebracketing of “a naddere” as “an addere”, from Old English n?dre, n?ddre (“snake, serpent, viper, adder”), from Proto-Germanic *nadr? (“snake, viper”) (compare West Frisian njirre, Dutch adder, German Natter, Otter), from pre-Germanic *néh?treh?, variant of Proto-Indo-European *n?h?trih? (compare Welsh neidr, Latin natr?x (“watersnake”)), from *(s)neh?- (“to spin, twist”) (compare Dutch naaien).

Noun

adder (plural adders)

1. (obsolete) Any snake.
2. A name loosely applied to various snakes more or less resembling the viper; a viper.
   1. (chiefly Britain) A small venomous serpent of the genus Vipera
      1. The common European adder (Vipera berus).
   2. The puff adders, of Africa (genus Bitis).
   3. (US, Canada) Any of several small nonvenomous snakes resembling adders
      1. Lampropeltis triangulum (milk snake).
      2. Heterodon spp. (hog-nosed snakes), a genus of harmless colubrid snakes found in North America
   4. Certain venomous snakes resembling other adders
      1. Acanthophis spp. (death adders), elapid snakes found in Southeast Asia and Australia
      2. Agkistrodon contortrix mokasen, the northern copperhead, a venomous viper found in the eastern United States
   5. A sea stickleback or adder fish (Spinachia spinachia).

Etymology 2

From add +‎ -er.

Noun

adder (plural adders)

1. Someone who or something which performs arithmetic addition; a machine for adding numbers.
2. Something which adds or increases.

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