noun, plural philtra [fil-truh] .
Anatomy. the vertical groove on the surface of the upper lip, below the septum of the nose.
a philter.

1600–10; < Latin: love philter < Greek phíltron love philter, dimple in upper lip. See phil-, -tron Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
philtrum (ˈfɪltrəm)
n , pl philtra
the indentation above the upper lip
[C17: from Latin, see philtre]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

philtrum phil·trum (fĭl'trəm)
n. pl. phil·tra (-trə)
The vertical indentation in the midline of the upper lip. Also called infranasal depression.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Running down the center of the outer surface of the upper lip is a shallow groove-the philtrum.
The philtrum is the vertical groove between the nose and the middle part of the upper lip.
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