Noun yellow jacket has 2 senses
  1. pentobarbital sodium, pentobarbital, Nembutal, yellow jacket - a barbiturate (trade name Nembutal) used as a sedative and hypnotic and anti-spasmodic
    --1 is a kind of barbiturate
  2. yellow jacket, yellow hornet, Vespula maculifrons - small yellow-marked social wasp commonly nesting in the ground
    --2 is a kind of hornet
    --2 is a member of Vespula, genus Vespula
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