(US, chiefly, Southern US) Any biting midge (family ), small flies (1–4 mm long); sometimes the species in particular.
Wherever we look up, there suspended against an areola of humming fluorescent white, is a shadowy funnel of tiny flies, bobbing in the air. 'No-See-Um's. This is what one employee calls them.
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Any biting bug or insect that is normally too small to see with an unaided eye.
These two examples of insect life are the scourge of the North Country, or any country in which they may be found. Many local people refer to any small black fly as a “no-see-Um" but the true bug by that name is indeed very hard to see.
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