jointworm

noun joint·worm \ ˈjȯint-ˌwərm \

Definition of jointworm

: the larva of any of several small chalcid wasps (genus Tetramesa synonym Harmolita) that attacks the stems of grain-producing plants (as wheat or barley) and causes swellings like galls at or just above the first joint

First Known Use of jointworm

1851

in the meaning defined above

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