| briefly | (adverb) for a short time | - |
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| (adverb) in a concise manner; in a few words | Synonyms: concisely, in brief, in short, shortly |
| chiefly | (adverb) for the most part | Synonyms: in the main, mainly, primarily, principally |
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| firefly | (noun) nocturnal beetle common in warm regions having luminescent abdominal organs | Synonyms: lightning bug |
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| (noun) tropical American click beetle having bright luminous spots | Synonyms: fire beetle, Pyrophorus noctiluca |
| horsefly | (noun) large swift fly the female of which sucks blood of various animals | Synonyms: cleg, clegg, horse fly |
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| (noun) winged fly parasitic on horses | Synonyms: Hippobosca equina, horse tick |
| housefly | (noun) common fly that frequents human habitations and spreads many diseases | Synonyms: house fly, Musca domestica |
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| snakefly | (noun) predatory insect of western North America having a long necklike prothorax | - |
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| spongefly | (noun) hairy-bodied insect whose larvae feed on freshwater sponges | Synonyms: spongillafly |
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| stonefly | (noun) primitive winged insect with a flattened body; used as bait by fishermen; aquatic gilled larvae are carnivorous and live beneath stones | Synonyms: plecopteran, stone fly |
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| whitefly | (noun) minute insect that feeds on plant juices; related to scale insects | - |
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