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Webster 1913 Edition
Adder
Ad′der
,Noun.
 [OE. 
addere
, naddere
, eddre
, AS. nædre
, adder, snake; akin to OS. nadra
, OHG. natra
, natara
, Ger. natter
, Goth. nadrs
, Icel. naðr
, masc., naðra
, fem.: cf. W. neidr
, Gorn. naddyr
, Ir. nathair
, L. natrix
, water snake. An adder 
is for a nadder
.] 1. 
A serpent. 
[Obs.] 
“The eddre seide to the woman.” Wyclif. Gen. iii. 4. )
 2. 
(Zool.) 
(a) 
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
. (b) 
In America, the term is commonly applied to several harmless snakes, as the 
milk adder
, puffing adder
, etc. (c) 
Same as 
Sea Adder
. ☞ In the sculptures the appellation is given to several venomous serpents, – sometimes to the horned viper (
Cerastles
). Webster 1828 Edition
Adder
AD'DER
,Noun.
  A venomous serpent or viper, of several species.
Definition 2025
Adder
adder
adder
See also: Adder
English

The head of the common European adder (Vipera berus)

The sea stickleback or adder-fish (Spinachia spinachia)
Noun
adder (plural adders)
- (obsolete) Any snake.
 -  A name loosely applied to various snakes more or less resembling the viper; a viper.
- (chiefly Britain) A small venomous serpent of the genus Vipera
 - The puff adders, of Africa (genus Bitis).
 -  (US, Canada) Any of several small nonvenomous snakes resembling adders
- Lampropeltis triangulum (milk snake).
 - Heterodon spp. (hog-nosed snakes), a genus of harmless colubrid snakes found in North America
 
 -  Certain venomous snakes resembling other adders
- Acanthophis spp. (death adders), elapid snakes found in Southeast Asia and Australia
 - Agkistrodon contortrix mokasen, the northern copperhead, a venomous viper found in the eastern United States
 
 - A sea stickleback or adder fish (Spinachia spinachia).
 
 
Derived terms
Translations
snake
  | 
viper
  | 
  | 
Etymology 2
Noun
adder (plural adders)
- Someone who or something which performs arithmetic addition; a machine for adding numbers.
 -  Something which adds or increases.
- They sought out cost adders with an eye toward eliminating them.
 
 
Derived terms
- carry-lookahead adder
 - carry-save adder
 - carry-skip adder
 - full adder
 - half adder
 
Translations
Anagrams
Dutch
Pronunciation
Etymology
From Middle Dutch adder, adre, misdivison of nadder, nadre, from Old Dutch *nadra, from Proto-Germanic *nadrǭ.
Noun
adder m, f (plural adders or adderen, diminutive addertje n)
Derived terms
- addergebroed
 - een addertje onder het gras