What does "stonefly" mean?

Any of the freshwater aquatic insects in the order Plecoptera.

What is a synonym for "stonefly"?

Common synonyms include: plecopteran, stone fly.

noun

noun ·Rare ·Advanced level

Noun

1
Any of the freshwater aquatic insects in the order Plecoptera.
2
primitive winged insect with a flattened body; used as bait by fishermen; aquatic gilled larvae are carnivorous and live beneath stones wordnet

From stone + fly.

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