ADDER
adder, common viper, Vipera berus
(noun) small terrestrial viper common in northern Eurasia
adder
(noun) a machine that adds numbers
adder
(noun) a person who adds numbers
Source: WordNet® 3.1
Etymology 1
Noun
adder (plural adders)
(obsolete) Any snake.
A name loosely applied to various snakes more or less resembling the viper; a viper.
(chiefly, British) A small venomous serpent of the genus Vipera
The common European adder (Vipera berus).
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 snake), 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).
Etymology 2
Noun
adder (plural adders)
Someone who or something which performs arithmetic addition; a machine for adding numbers.
Something which adds or increases.
Anagrams
• dared, dread, radde, re-add, readd
Source: Wiktionary
Add"er, n. Etym: [See Add.]
Definition: One who, or that which, adds; esp., a machine for adding
numbers.
Ad"der, n. Etym: [OE. addere, naddere, eddre, AS. nædre, adder,
snake; akin to OS. nadra, OHG. natra, natara, Ger. natter, Goth.
nadrs, Icel. nathr, masc., nathra, 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. (Zoöl.)
(a) A small venomous serpent of the genus Vipera. The common European
adder is the Vipera (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.
Note: In the sculptures the appellation is given to several venomous
serpents, -- sometimes to the horned viper (Cerastles).
Source: Webster’s Unabridged Dictionary 1913 Edition