Definition of frass in English:


Syllabification: frass
Pronunciation: /fras


  • 1Fine powdery refuse or fragile perforated wood produced by the activity of boring insects.
    More example sentences
    • We felt the fine, sharply scented frass of a carpenter ant colony with our fingertips.
    • By the end of the experiment, an average of 25% of the cotyledon of Q. alba acorns had been reduced to frass, while there was no apparent damage in any of the final sample of RO acorns.
  • 1.1The excrement of insect larvae.
    More example sentences
    • One downside of group dining is that chemical signals from the larvae and their frass can attract parasitoids.
    • As a bit of frass starts to emerge from the caterpillar, it pushes a hinged plate against a ring of blood vessels surrounding the anus.
    • The chemical analyses of the body and frass of Blepharida flavocostata revealed almost no match to the constituents found in B. biflora.


mid 19th century: from German Frass, from fressen 'devour'.

More definitions of frass

Definition of frass in:

Get more from Oxford Dictionaries

Subscribe to remove adverts and access premium resources

Word of the day grotesquerie
Pronunciation: grəʊˈtɛskəri
grotesque quality or grotesque things collectively