phil·trum

[fil-truhm]
noun, plural phil·tra [-truh] .
1.
Anatomy. the vertical groove on the surface of the upper lip, below the septum of the nose.
2.
a philter.

Origin:
1600–10; < Latin: love philter < Greek phíltron love philter, dimple in upper lip. See phil-, -tron

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Collins
World English Dictionary
philtrum (ˈfɪltrəm) [Click for IPA pronunciation guide]
 
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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00:10
Philtrum is always a great word to know.
So is patella. Does it mean:
the flat, movable bone at the front of the knee; the kneecap
the transparent anterior part of the external coat of the eye covering the iris and the pupil and continuous with the sclera
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
The philtrum is the vertical groove between the nose and the middle part of the upper lip.
Running down the center of the outer surface of the upper lip is a shallow groove-the philtrum.
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