Fr.: dériver de, tirer de
From O.Fr. dériver, from L. derivare "to draw off (a stream of water), from its source," from de- "from" + riv(us) "a stream" + -are infinitive suffix.
Vâxanidan, from vâ- prefix which indicates "returning to, reference," → de-, + xan "source," variant xân (Gilaki xoni, Tabari xoni, Laki kyani, Tâleši xâni, xoni, Mid.Pers. xân, xânig "source, spring," Av. xā-, xan- "source, fountain, spring," xayana- "belonging to a spring," cf. Khotanese khâhâ- "spring, fountain," Skt. khâ'- "spring, source") + -idan infinitive suffix.
Determined by mathematical computation; formed or developed from something else; not original.
P.p. of → derive.