A small moth, Retinia resinella (family Tortricidae), whose larvae infest the twigs of pine trees, causing them to exude resin that forms a gall-like chamber inside which the larva lives.
Origin
Early 20th century.
Definition of resin-gall moth in US English:
resin-gall moth
noun
A small moth, Retinia resinella (family Tortricidae), whose larvae infest the twigs of pine trees, causing them to exude resin that forms a gall-like chamber inside which the larva lives.