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1. A philter or love potion. 2. [NA] The infranasal depression; the groove in the midline of the upper lip. [L., fr. G. philtron, a love-charm, depression on upper lip, fr. phileo, to love]
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phil·trum (filґtrəm) [Gr. philtron love potion] [TA] the vertical groove in the median portion of the upper lip, a part of the prolabium.
Medical dictionary. 2011.