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Any of numerous insects, especially moths and flies, that in the larval stage burrow into and feed on the internal tissue of leaves.
1. (Animals) any of various insect larvae that bore into and feed on leaf tissue, esp the larva of dipterous flies of the genus Philophylla (family Trypetidae) and the caterpillar of moths of the family Gracillariidae
2. (Animals) the adult insect of any of these larvae
any of various insect larvae, including small caterpillars, that tunnel into leaves and stems, leaving winding trails or broad blotches of pale tissue.