glow·worm

[gloh-wurm]
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:
1300–50; Middle English. See glow, worm

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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WordNet
glowworm

noun
the luminous larva or wingless grub-like female of a firefly 
WordNet® 3.0, © 2006 by Princeton University.
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00:10
Glowworm is always a great word to know.
So is ninnyhammer. Does it mean:
a fool or simpleton; ninny.
a chattering or flighty, light-headed person.
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