noun
- the droppings or fecal pellets of insects, especially caterpillars and other larvae
Usage: entomology; technical
Examples
- The gardener noticed frass on the leaves, indicating the presence of caterpillars.
- Frass from the beetle larvae accumulated at the base of the tree.
- Entomologists often identify insect species by examining their frass under a microscope.
- The fine frass particles fell like dust from the infested branches.
- Farmers use the presence of frass as an early warning sign of pest infestation.