yellow jacket

noun

plural yellow jackets

1

or yellowjacket

ˈye-lō-ˌja-kət   

ˈye-lə-

plural yellowjackets : any of various small vespid wasps (genus Vespula and Dolichovespula) typically with abdomens marked with yellow and black that build nests in the ground or less commonly in aerial locations (such as the eaves of buildings), that usually reach a length of up to .5 inches (1.3 centimeters), and that can sting repeatedly and painfully

2

slang : pentobarbital especially in a yellow capsule

—usually used in plural

Examples of yellow jacket in a Sentence

Recent Examples on the Web

Officials also want people to know half of the Grand Prix course will remain open to the public and downtown ambassadors in yellow jackets will be available throughout the weekend to help people navigate the area. —Elaine Rojas-Castillo, CBS News, 28 May 2026

The officer walked with the baby over floodwaters to another first responder who placed a large yellow jacket over the carrier to keep the child from getting wet from the torrential rains. —Kimberlee Speakman, PEOPLE, 26 May 2026

Some wasp types, such as paper wasps and yellow jackets, are known to build a nest even if another colony is nearby if the nesting site meets their criteria. —Karen Brewer Grossman, Southern Living, 9 May 2026

Remove insect nests from walls and rodent-proof outbuildings — bears naturally seek insect larvae such as ants, yellow jackets, wasps, or various seeds and nuts stashed by rodents. —Sarah Moore, Freep.com, 8 May 2026

Word History

First Known Use

1796, in the meaning defined at sense 1

Rhymes for yellow jacket

• bracket
• packet
• racket
• racquet
• straitjacket

Kids Definition

yellow jacket

noun

: any of various small social wasps with yellow markings that commonly nest in the ground and can sting repeatedly and painfully

Medical Definition

yellow jacket

noun

1

or yellowjacket

ˈyel-ō-ˌjak-ət 

: any of various small, social wasps (genus Vespula and Dolichovespula of the family Vespidae) typically with abdomens marked with yellow and black that build nests in the ground or less commonly in aerial locations (as the eaves of buildings), that aggressively defend their nests, and that can sting repeatedly and painfully

2

slang : pentobarbital especially in a yellow capsule

—usually used in plural