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Webster 1913 Edition

Adj.

Having no mane.

Maneless lion

(Zool.)

a variety of the lion having a short, inconspicuous mane. It inhabits Arabia and adjacent countries.

maneless ‎(not comparable)

Without a mane.
- 2002 April, Philip Caputo, “Maneless Lions”, in National Geographic:
  The scientists had partly suspected that the maneless males were adolescents mistaken for adults by amateur observers.