Jointworm meaning

jointwûrm
A larva of any of various chalcid wasps of the family Eurytomidae, especially of Tetramesa tritici, that infests grains, causing swelling and subsequent breakage near the first joint of the stem.
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The larva of a genus (Harmolita, family Eurytomidae) of small wasps which attack grain stems and cause galls to form in the joints.
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The larva of a hymenopterous fly, found in gall-like swellings on wheatstalks, usually around the first joint.
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Origin of jointworm