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From The Collaborative International Dictionary of English v.0.48:
Gum \Gum\, n. [OE. gome, AS. gama palate; akin Co G. gaumen, OHG. goumo, guomo, Icel. g?mr, Sw. gom; cf. Gr. ? to gape.] The dense tissues which invest the teeth, and cover the adjacent parts of the jaws. [1913 Webster] Gum rash (Med.), strophulus in a teething child; red gum. Gum stick, a smooth hard substance for children to bite upon while teething. [1913 Webster]