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Noun: yellow jacket  'ye-low,ja-kit
Usage: N. Amer
  1. A barbiturate (trade name Nembutal) used as a sedative and hypnotic and antispasmodic
    - pentobarbital sodium, pentobarbital [N. Amer], Nembutal, pentobarbitone [Brit]
  2. Small yellow-marked social wasp commonly nesting in the ground
    - yellow hornet, Vespula maculifrons

Derived forms: yellow jackets

Type of: barbiturate, hornet

Part of: genus Vespula, Vespula

Encyclopedia: Yellow jacket