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Webster 1913 Edition

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Noun.

(Zool.)

A large, venomous, two-winged fly, native of Abyssinia. It is allied to the tsetse fly, and, like the latter, is destructive to cattle.

zimb ‎(plural zimbs)

(archaic) An Ethiopian horsefly of the genus Pangonia, destructive to livestock.
- 1840, Robert Montgomery Martin, Colonial magazine and commercial-maritime journal: Volume 3 (page 155)
  The illustrious Bruce and others imagine, that in the zimb of Abyssinia they recognize the fly plague which afflicted the Egyptians.
- 1854, Samuel Griswold Goodrich, A history of all nations, from the earliest periods to the present time (volume 2, page 608)
  The zimb-fly sometimes depopulates whole territories, causing man and beast to fly from the lowlands into the mountains or the desert. Both the scorpion and locust infest the country.