a brand of medicated, often flavored petrolatum in a small tube, used as a salve for or protection against chapped lips.
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British Dictionary definitions for chapstick
mainly US and Canadian a cylinder of a substance for preventing or soothing chapped lips
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012