Origin: 1480–90; < Middle French (equivalent to Medieval Latin, Italian, Provençal, Spanish, Portuguese tara,Spanish atara) ≪ Arabic ṭarḥah what one throws away, derivative of ṭaraḥa to throw away
"difference between gross and net weight," 1486, from M.Fr. tare "wastage in goods, deficiency, imperfection" (15c.), from It. tara, from Arabic tarah, lit. "thing deducted or rejected," from taraha "to reject."