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]
From The Collaborative International Dictionary of English v.0.48:
Gum \Gum\, v. t. To deepen and enlarge the spaces between the teeth of (a worn saw). See Gummer. [1913 Webster]
From The Collaborative International Dictionary of English v.0.48:
Gum \Gum\, n. [OE. gomme, gumme, F. gomme, L. gummi and commis, fr. Gr. ?, prob. from an Egyptian form kam?; cf. It. gomma.] 1. A vegetable secretion of many trees or plants that hardens when it exudes, but is soluble in water; as, gum arabic; gum tragacanth; the gum of the cherry tree. Also, with less propriety, exudations that are not soluble in water; as, gum copal and gum sandarac, which are really resins. [1913 Webster]
2. (Bot.) See Gum tree, below. [1913 Webster]
3. A hive made of a section of a hollow gum tree; hence, any roughly made hive; also, a vessel or bin made of a hollow log. [Southern U. S.] [1913 Webster]
4. A rubber overshoe. [Local, U. S.] [1913 Webster]
Black gum, Blue gum, British gum, etc. See under Black, Blue, etc.
Gum Acaroidea, the resinous gum of the Australian grass tree (Xanlhorrh[oe]a).
Gum animal (Zool.), the galago of West Africa; -- so called because it feeds on gums. See Galago.
Gum animi or anim['e]. See Anim['e].
Gum arabic, a gum yielded mostly by several species of Acacia (chiefly A. vera and A. Arabica) growing in Africa and Southern Asia; -- called also gum acacia. East Indian gum arabic comes from a tree of the Orange family which bears the elephant apple.
Gum butea, a gum yielded by the Indian plants Butea frondosa and B. superba, and used locally in tanning and in precipitating indigo.
Gum cistus, a plant of the genus Cistus (Cistus ladaniferus), a species of rock rose.
Gum dragon. See Tragacanth.
Gum elastic, Elastic gum. See Caoutchouc.
Gum juniper. See Sandarac.
Gum Ladanum, a fragrant gum yielded by several Oriental species of Cistus or rock rose.
Gum passages, sap receptacles extending through the parenchyma of certain plants (Amygdalace[ae], Cactace[ae], etc.), and affording passage for gum.
Gum pot, a varnish maker's utensil for melting gum and mixing other ingredients.
Gum resin, the milky juice of a plant solidified by exposure to air; one of certain inspissated saps, mixtures of, or having properties of, gum and resin; a resin containing more or less mucilaginous and gummy matter.
Gum sandarac. See Sandarac.
Gum Senegal, a gum similar to gum arabic, yielded by trees (Acacia Verek and A. Adansoni[aum]) growing in the Senegal country, West Africa.
Gum tragacanth. See Tragacanth.
Gum water, a solution of gum, esp. of gum arabic, in water.
Gum wood, the wood of any gum tree, esp. the wood of the Eucalyptus piperita, of New South Wales. [1913 Webster]
From The Collaborative International Dictionary of English v.0.48:
Gum \Gum\, v. t. [imp. & p. p. Gummed (g[u^]md); p. pr. & vb. n. Gumming.] 1. To smear with gum; to close with gum; to unite or stiffen by gum or a gumlike substance; to make sticky with a gumlike substance. [1913 Webster]
He frets like a gummed velvet. --Shak. [1913 Webster]
2. To chew with the gums, rather than with the teeth. [PJC]
gum up (a) To block or clog (a conduit) with or as if with gum; as, to gum up the drainpipe. (b) to interfere with; to spoil. [Slang] [PJC]
From The Collaborative International Dictionary of English v.0.48:
Gum \Gum\, v. i. To exude or form gum; to become gummy. [1913 Webster]