Source : Webster's Revised Unabridged Dictionary (1913)

Kerite \Ke"rite\, n. [Gr. ke`ras, horn.]
   A compound in which tar or asphaltum combined with animal or
   vegetable oils is vulcanized by sulphur, the product closely
   resembling rubber; -- used principally as an insulating
   material in telegraphy. --Knight.