leaf miner

noun
any of the larvae of any of numerous insects, as moths of the family Gracilariidae, that live in and feed on the parenchyma of leaves.
Also, leaf·min·er.


Origin:
1820–30

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
leaf miner
 
n
1.  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.  the adult insect of any of these larvae

Collins English Dictionary - Complete & Unabridged 10th Edition
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Leaf miner is always a great word to know.
So is slumgullion. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a stew of meat, vegetables, potatoes, etc.
Example sentences
Effect of some organic insecticides on the population levels of the serpentine leaf miner and its parasites.
To identify leaf miner injury tear the leaf in two across the injury.
Varieties with larger leaflets are more preferred by the leaf miner than those with small leaflets.
The leaf miner also represents an additional factor contributing to spreading the canker at a faster pace.
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