Medical Dictionary
yellow jacket
noun
Medical Definition of YELLOW JACKET
1
: any of various yellow-marked social wasps (especially genus Vespula of the family Vespidae) that usually nest in the ground, aggressively defend their nests, and can sting repeatedly and painfully
2
slang : pentobarbital especially in a yellow capsule—usually used in plural
Illustration of YELLOW JACKET
Seen & Heard
What made you want to look up yellow jacket? Please tell us where you read or heard it (including the quote, if possible).