[joint-wurm] 
| the larva of any of several chalcid flies of the family Eurytomidae, esp. of the genus Harmolita, that feeds within the stems of grasses, often causing a gall near the first joint. |
| joint·worm (joint'wûrm') n. The larva of certain wasps of the family Eurytomidae, especially of Harmolita tritici, that infest grains and cause hard swellings near the first joint of the stems. |
