| shellac | A resinous excretion of an insect, Laccifer (Tachardia) lacca (family Coccidae). The insects suck the juice of various resiniferous Asiatic (chiefly Indian) trees and excrete and deposit "stick-lac." shellac softens at a low temperature. It has many nonmedicinal uses and is also used to coat confections and tablets and in dental materials, e.g., impression compound and denture base plates. Synonym: lacca. (05 Mar 2000) |
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| shellac base | A resinous wafer adapted to maxillary or mandibular casts to form baseplates. (05 Mar 2000) |