adder

noun

Etymology: Etymology tree English add Proto-Indo-European *-yósder. Proto-Italic *-āzijos Latin -āriusnom. Latin -āriusbor. Proto-Germanic *-ārijaz Proto-West Germanic *-ārī Old English -ere Middle English -ere English -er English adder From add + -er.

1. Someone who or something which performs arithmetic addition; a machine for adding numbers.
2. An electronic device that adds voltages, currents or frequencies.
3. Something which adds or increases.

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