Definition of house moth in US English:

house moth

noun

  • Any moth that has a tendency to enter buildings and whose larvae damage textiles and are a pest of stored foodstuffs; especially either of two predominantly brownish moths of the family Oecophoridae, Hofmannophila pseudospretella and Endrosis sarcitrella, which has white foreparts.

Origin

Early 19th century; earliest use found in Walter Nicol (d. 1811).