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ester gum

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noun Chemistry.
  1. any of several hard resins produced by the esterification of a natural resin, especially rosin, with a polyhydric alcohol, chiefly glycerol: used in the manufacture of paints, varnishes, and lacquers.
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Origin of ester gum

First recorded in 1935–40
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018