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glowworm

[gloh-wurm] /ˈgloʊˌwɜrm/
noun
1.
the wingless female or larva of the European beetle, Lampyris noctiluca, which emits a sustained greenish light.
2.
any of various other beetle larvae or wingless females that emit a glow rather than a flash of light.
Origin
1300-1350
1300-50; Middle English. See glow, worm
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for glow-worm

glow-worm

noun
1.
a European beetle, Lampyris noctiluca, the females and larvae of which bear luminescent organs producing a greenish light: family Lampyridae
2.
any of various other beetles or larvae of the family Lampyridae
See also firefly (sense 1)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for glow-worm
n.

early 14c., from glow (v.) + worm (n.).

Online Etymology Dictionary, © 2010 Douglas Harper
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8
10
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