noun
Refers to tiny biting flies of the family Ceratopogonidae; common in damp areas.
夏の夕方、川の近くでヌカカに刺された。
I was bitten by no-see-ums near the river on a summer evening.
The word is a compound of 糠 (ぬか, rice bran) and 蚊 (か, mosquito), referring to the insect's tiny size. The exact historical derivation is uncertain.