gall-fly
(ˈgɔːlflaɪ)
[f. gall n.3]
An insect (of the genus Cynips) which produces galls on trees.
| 1822–34 Good's Study Med. (ed. 4) I. 316 The larvæ of the cynips querci, or gall-fly. 1868 Wood Homes without H. xxv. 482 Cynipidae..are popularly known as Gall Flies. |