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A colorless gaseous hydrocarbon (C3H6) of the ethylene series, having a garlic odor. It occurs in coal gas, and is produced artificially in various ways. Called also propene.

A sulphide of arsenic and silver of a beautiful cochineal-red color, occurring in rhombohedral crystals, and also massive; ruby silver.

False or imaginary feeling or sense perception such as occurs in hypochondriasis, or such as is referred to an organ that has been removed, as an amputated foot.

A hydrous oxide of manganese, occurring in smooth, botryoidal forms, and massive, and having an iron-black or steel-gray color.

Vanadate of bismuth, occurring in minute reddish brown crystals.

Ruby silver; dark red silver ore. It is a sulphide of antimony and silver, occurring in rhombohedral crystals or massive, and is of a dark red or black color with a metallic adamantine luster.

A niobate of calcium, cerium, and other bases, occurring usually in octahedrons of a yellowish or brownish color and resinous luster; -- so called from its becoming grass-green on being subjected to heat under the blowpipe.

Native lead phosphate with lead chloride, occurring in bright green and brown hexagonal crystals and also massive; -- so called because a fused globule crystallizes in cooling.

A common mineral occurring in monoclinic crystals, with a prismatic angle of nearly 90º, and also in massive forms which are often laminated. It varies in color from white to dark green and black, and includes many varieties differing in color and composition, as diopside, malacolite, salite, coccolite, augite, etc. Th…

Occurring once in four years, or at the end of every four years; as, quadrennial games.

Of or pertaining to the fourth; occurring every fourth day, reckoning inclusively; as, a quartan ague, or fever.

A form of silica, or silicon dioxide (SiO2), occurring in hexagonal crystals, which are commonly colorless and transparent, but sometimes also yellow, brown, purple, green, and of other colors; also in cryptocrystalline massive forms varying in color and degree of transparency, being sometimes opaque.…

Massive quartz occurring as a rock; a metamorphosed sandstone; -- called also quartz rock.

A word occurring in a corrupt passage of Bacon's Essays, and probably meaning, to stir, to move.

A yellow crystalline substance, occurring quite widely distributed in the vegetable kingdom, as is apple-tree bark, horse- chestnut leaves, etc., but originally obtained by the decomposition of quercitrin. Called also meletin.

The first motion of the fetus in the womb felt by the mother, occurring usually about the middle of the term of pregnancy. It has been popularly supposed to be due to the fetus becoming possessed of independent life.

Occurring once in five years, or at the end of every five years; also, lasting five years. A quinquennial event.

Occurring as the fifth, after four others also, occurring every fifth day, reckoning inclusively; as, a quintan fever. -- n. (Med.)

Occurring or returning daily; as, a quotidian fever.

property, and is explained as result from a disintegration of the atom. This breaking up occurs in at least seven stages; the successive main products have been studied and are called radium emanation or exradio, radium A, radium B, radium C, etc. (The emanation is a heavy gas, the later products are solids.) These pr…