Definitions for yellow jacket
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Random House Webster's College Dictionary
yel′low jack`et(n.)
any of several paper wasps of the family Vespidae, having black and bright yellow bands.
Category: Entomology
Slang. a yellow capsule of phenobarbital.
Category: Pharmacology, Status (usage)
Origin of yellow jacket:
1790–1800, Amer.
Princeton's WordNet
pentobarbital sodium, pentobarbital, Nembutal, yellow jacket(noun)
a barbiturate (trade name Nembutal) used as a sedative and hypnotic and antispasmodic
yellow jacket, yellow hornet, Vespula maculifrons(noun)
small yellow-marked social wasp commonly nesting in the ground
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