leaf miner

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. Any of numerous small flies and moths that in the larval stage dig into and feed on leaf tissue.

Century Dictionary and Cyclopedia

1. n. The larva of a moth of the family Tineidæ: so called because these caterpillars feed mostly on the parenchyma of leaves, and between the upper and lower surfaces.
2. n. S. graminum, a congeneric European insect, also occurring in the United States. It is also called imported cabbage leaf-miner.

Wiktionary

1. n. An insect larva that lives within leaf tissue.

GNU Webster's 1913

1. n. (Zoöl.) any one of various small lepidopterous and dipterous insects, which, in the larval stages, burrow in and eat the parenchyma of leaves.

WordNet 3.0

1. n. any of various small moths or dipterous flies whose larvae burrow into and feed on leaf tissue especially of the family Gracilariidae
2. n. any of various small moths or dipterous flies whose larvae burrow into and feed on leaf tissue especially of the family Gracilariidae