any insect of the order Plecoptera, in which the larvae are aquatic, living beneath stones, and the adults have long antennae and two pairs of large wings and occur near water
Word origin
C15: so called because its larvae live under stones in rivers
Examples of 'stoneflies' in a sentence
stoneflies
Britain's rivers have been hit, too - with scientists charting a general collapse in populations of caddisflies, mayflies and stoneflies.