Frass refers loosely to the more or less solid excreta of insects, and to certain other related matter.
Frass is an informal term and accordingly it is variously used and variously defined. It is derived from the German word Fraß, which means the food takeup of an insect. The English usage applies to excreted residues of anything that insects had eaten, and similarly, to other chewed or mined refuse that insects leave behind. It does not generally refer to fluids such as honeydew.
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