philtrum
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phil·trum
(fĭl′trəm)n. pl. phil·tra (-trə) or philtrums
1. In humans and certain other primates, the vertical indentation in the center of the upper lip.
2. In many other mammals, the cleft running through the center of the upper lip and often between the nostrils.
[New Latin, from Latin, philter, from Greek philtron, philter, charm, philtrum; see philter.]
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.
philtrum
(ˈfɪltrəm)n, pl philtra
(Anatomy) the indentation above the upper lip
[C17: from Latin, see philtre]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
phil•trum
(ˈfɪl trəm)n., pl. -tra (-trə).
1. the vertical groove on the surface of the upper lip, below the nose.
2. philter.
[1600–10; < Latin: love philter < Greek phíltron love philter, dimple in upper lip. See phil-, -tron]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.