der·ma·tome (dûr?m?-t?m?)n.1. Anatomy An area of skin innervated by sensory fibers from a single spinal nerve.2. Medicine An instrument used in cutting thin slices of the skin, as for skin grafts.3. Embryology The part of a mesodermal somite from which the dermis develops.[derma- + -tome.]American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.dermatome (?d??m??t??m) n1. (Surgery) a surgical instrument for cutting thin slices of skin, esp for grafting2. (Anatomy) the area of skin supplied by nerve fibres from a single posterior spinal root3. (Physiology) embryol the part of a somite in a vertebrate embryo that gives rise to the dermis dermatomic adjCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014der?ma?tome (?d?r m??to?m) n. the portion of a mesodermal somite in an embryo that develops into dermis. [1925?30] der`ma?tom?ic (-?t?m ?k) der`ma?to?mal, adj. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.