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umber moth

British  

noun

  1. Often shortened to: umber.  any of various brownish geometrid moths, esp the waved umber ( Menophra abruptaria ) and small waved umber ( Horisme vitalbata ), that are cryptically marked to merge with tree bark, and the mottled umber ( Erannis defoliaria ) whose looper larvae can strip branches and even trees

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