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Meaning of handwarmer

hand•warm•er

Pronunciation: (hand'wôr"mur), [key]
— n.
  1. a small, flat, usually pocket-size device containing material, as chemicals, hot liquids, or a battery-operated heating element, for warming the hands.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.