Definition of union rustic in English:

union rustic

noun

rare
  • A Eurasian noctuid moth, Eremobina pabulatricula, having distinctive brown markings on pale forewings.

    Possibly extinct in the United Kingdom, its last sighting being reported in 1935.

Origin

Mid 19th century; earliest use found in William Wood (1774–1857), conchologist and bookseller.