adder

American Heritage® Dictionary of the English Language, Fourth Edition

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

Century Dictionary and Cyclopedia

1. 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. It grows to a length of about 2 feet, of which the tail constitutes one eighth; the head is oval, with a blunt snout; the color varies from brown or olive to brownish-yellow, variegated with a row of large confluent rhombic spots along the middle line of the back, and a row of small black or blackish spots on each side. Though the adder is venomous, its bite is not certainly known to be fatal.
2. n. A name loosely applied to various snakes more or less resembling the viper, Pelias berus: as By the translators of the authorized version of the Bible, to several different species of venomous serpents.
3. n. The sea-stickleback or adder-fish. See adder-fish.
4. n. One who adds.
5. n. An instrument for performing addition.

Wiktionary

1. n. Someone who or something which performs arithmetic addition.
2. n. Something which adds or increases.
3. n. obsolete A snake.
4. n. A name loosely applied to various snakes more or less resembling the viper; a viper.
5. n. chiefly UK 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.
6. n. US, Canada Any of several small nonvenomous snakes resembling the adder, such as the milk snake.
7. n. The sea-stickleback or adder-fish.

GNU Webster's 1913

1. n. One who, or that which, adds; esp., a machine for adding numbers.
2. n. obsolete A serpent.
3. 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.
4. n. In America, the term is commonly applied to several harmless snakes, as the milk adder, puffing adder, etc.
5. n. Same as Sea Adder.

WordNet 3.0

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