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Webster 1913 Edition

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Adj.

Shaped like a bat’s wing;

as, a

bat's-wing

burner

batwing ‎(not comparable)

Shaped like the wing of a bat.
- 1977, John Le Carré, The Honourable Schoolboy, Folio Society 2010, p. 491:
  The junk was nearer, beating in toward the island, her brown batwing sail suddenly tall and terribly conspicuous against the sky.
- 2012, James E. Ferrell, Cross-Pull (page 385)
  A tall figure stepped up to the batwing doors of the saloon as Tommy and Matt passed.

batwing ‎(plural batwings)