(n.) One who, or that which, adds; esp., a machine for adding numbers.
(n.) A serpent.
(n.) A small venomous serpent of the genus Vipera. The common European adder is the Vipera (/ 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.
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Webster, Noah. Entry for 'Adder'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/a/adder.html. 1828.