cleg Meaning, Definition & Usage

  1. noun large swift fly the female of which sucks blood of various animals
    clegg; horse fly; horsefly.

WordNet

Cleg noun
Etymology
Northern Eng. & Scot. gleg: cf. Gael. crethleag.
Definitions
  1. (Zoöl.) A small breeze or horsefly. North of Eng. & Scot. Jamieson.

Webster 1913