Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
no-see-um is a noun meaning "minute two-winged insect that sucks the blood of mammals and birds and other insects". It carries one recorded sense.
minute two-winged insect that sucks the blood of mammals and birds and other insects
Definitions, synonyms and semantic relations for no-see-um come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.