Dictionary![]() ![]() phil•trumPronunciation: (fil'trum), [key] —n., —pl. -traPronunciation: (-tru). [key] 1. Anat.the vertical groove on the surface of the upper lip, below the septum of the nose. 2. a philter. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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