Search the Dictionary

Half crystalline; -- said of certain cruptive rocks composed partly of crystalline, partly of amorphous matter.

An alkaloid obtained from the yellow jasmine (Gelsemium sempervirens), as a bitter white semicrystalline substance; -- called also gelsemia.

s Inula, Helianthus, Campanula, etc., and is extracted by solution as a tasteless, white, semicrystalline substance, resembling starch, with which it is isomeric. It is intermediate in nature between starch and sugar. Called also dahlin, helenin, alantin, etc.

A white concretionary form of calcium carbonate, usually hard and semicrystalline. It is deposited from the water of springs or streams holding lime in solution. Extensive deposits exist at Tivoli, near Rome.