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lobe (n.)

early 15c., "a lobe of the liver or lungs," from Medieval Latin lobus "a lobe," from Late Latin lobus "hull, husk, pod," from Greek lobos "lobe, lap, slip; vegetable pod," used of lap- or slip-like parts of the body or plants, especially "earlobe," but also of lobes of the liver or lungs, a word of unknown origin. It is perhaps related to Greek leberis "husk of fruits," from PIE *logwos. Beekes writes that the proposed connection with the PIE source of English lap (n.1)) "is semantically attractive." Extended 1670s to divisions of the brain; 1889 to ice sheets. The common notion is "rounded protruding part."

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Definitions of lobe from WordNet

lobe (n.)
(anatomy) a somewhat rounded subdivision of a bodily organ or part;
ear lobe
lobe (n.)
(botany) a part into which a leaf is divided;
lobe (n.)
the enhanced response of an antenna in a given direction as indicated by a loop in its radiation pattern;
lobe (n.)
a rounded projection that is part of a larger structure;
From wordnet.princeton.edu