early 15c., from Old French nutrition (14c.) and directly from Latin nutritionem (nominative nutritio) "a nourishing," noun of action from past participle stem of nutrire "to nourish, suckle" (see nourish).
1660s, from Latin nutricius "that which nourishes, nurses," from nutrix (genitive nutricis) "a nurse," from nutrire (see nourish). Related: Nutritiously.