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From The Collaborative International Dictionary of English v.0.48:
no-see-um \no-see-um\ n. (Zool.) Any of several minute two-winged biting insects of the family Ceratopogonidae that suck the blood of mammals and birds and other insects; also called biting midge and punkie. Syn: punkie, punky, punkey, biting midge. [WordNet 1.5]