Definition of "frass" [frass]

• Debris or excrement produced by insects. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Over here, we are celebrating what chewed leaves, in this particular case, chewed tomato leaves, turn into: frass, that is, insect shit."
• "Yes, caterpillar shit is called frass, and yes, it's derived from fressen."
• "(or more specifically called frass) coming out of them."