Definitions

1. noun

A small or primitive insect of the order Diptera, especially a midge or a fungus gnat.

“The water in the pond was teeming with tiny syllids that fed on the algae.”

2. noun

In biology, a type of larva, especially a larva of a dipterous insect.

“The biologist studied the development of the syllid larva to understand its life cycle.”