Stone fly Meaning, Definition & Usage

  1. noun primitive winged insect with a flattened body; used as bait by fishermen; aquatic gilled larvae are carnivorous and live beneath stones
    plecopteran; stonefly.

WordNet

Definitions
  1. (Zoöl.), any one of many species of pseudoneuropterous insects of the genus Perla and allied genera; a perlid. They are often used by anglers for bait. The larvæ are aquatic.

Webster 1913