adder

noun

1. (obsolete)Any snake.
2. (British)A name loosely applied to various snakes more or less resembling a viper.

   “Entirely filled with the image of another, her heart, indeed, had the deaf ear of the adder, which heedeth not the voice of the charmer, charm he never so wisely.”

   “These include the county's [Cumbria's] only venomous snake - the adder - which relies on exposed elements to successfully breed its young.”

3. (British)A name loosely applied to various snakes more or less resembling a viper.
4. A name loosely applied to various snakes more or less resembling a viper.
5. (Canada, US)A name loosely applied to various snakes more or less resembling a viper.
6. (Canada, US)A name loosely applied to various snakes more or less resembling a viper.
7. A name loosely applied to various snakes more or less resembling a viper.
8. A name loosely applied to various snakes more or less resembling a viper.
9. A sea stickleback or adder fish (Spinachia spinachia).
10. Someone who or something which performs arithmetic addition; a machine for adding numbers.
11. An electronic device that adds voltages, currents or frequencies.
12. Something which adds or increases.

    “They sought out cost adders with an eye toward eliminating them.”

13. (informal)A person who has attention deficit disorder.

    “Many ADDers become targets for bullies and are routinely harassed at school.”