Firebrat meaning

fīr'brăt'
A small wingless insect (Thermobia domestica) closely related to the silverfishes and inhabiting warm areas of buildings, as around furnaces or boilers.
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Any of various small thysanuran insects (Thermobia domestica) resembling silverfish, found in hot areas, as around steam pipes or fireplaces.
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A thysanuran insect, Thermobia domestica.
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Origin of firebrat

  • fire +‎ brat, after their habit of collecting near furnaces.
    From Wiktionary