derive (v.)

late 14c., from Old French deriver "to flow, pour out; derive, originate," from Latin derivare "to lead or draw off (a stream of water) from its source" (in Late Latin also "to derive"), from phrase de rivo (de "from" + rivus "stream," from PIE root *rei- "to run, flow"). Etymological sense is 1550s. Related: Derived; deriving.