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The Collaborative International Dictionary of English v.0.48 (gcide)

Lobe \Lobe\ (l[=o]b), n. [F. lobe, Gr. lobo`s.]
Any projection or division, especially one of a somewhat
rounded form; as:
(a) (Bot.) A rounded projection or division of a leaf.
--Gray.
(b) (Zool.) A membranous flap on the sides of the toes of
certain birds, as the coot.
(c) (Anat.) A round projecting part of an organ, as of the
liver, lungs, brain, etc. See Illust. of {Brain}.
(b) (Mach.) The projecting part of a cam wheel or of a
non-circular gear wheel.
[1913 Webster]

{Lobe of the ear}, the soft, fleshy prominence in which the
human ear terminates below, also called the {earlobe}.
See. Illust. of {Ear}.
[1913 Webster PJC]