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Coleoptera (n.)

insect order having the wings sheathed by hardened shells, 1763, from Modern Latin, from Greek koleopteros, literally "sheath-wing," used by Aristotle to describe beetles, from koleos "sheath" (from PIE root *kel-(1) "to cover, conceal, save") + pteron "wing" (see ptero-). Related: Coleopterous; coleopteran; coleopteral.