excision of a lobe of an organ or gland.
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British Dictionary definitions for lobectomy
surgical removal of a lobe from any organ or gland in the body, esp removal of tissue from the frontal lobe of the brain in an attempt to alleviate mental disorder
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012