Search the Dictionary

A hypochondriacal condition verging upon insanity, occurring in those whose brains have been unduly taxed; -- called also brain fag.

A rare metallic element, occurring in the minerals cerite, allanite, monazite, etc. Symbol Ce. Atomic weight 141.5. It resembles iron in color and luster, but is soft, and both malleable and ductile. It tarnishes readily in the air.

A hydrous silicate of magnesium, allied to serpentine, occurring in waxlike masses of a yellow or greenish color.

Native lead carbonate; a mineral occurring in colorless, white, or yellowish transparent crystals, with an adamantine, also massive and compact.

A mineral occuring in glassy rhombohedral crystals, varying, in color from white to yellow or red. It is essentially a hydrous silicate of alumina and lime. Called also chabasie.

A form of malarial fever occurring along the Chagres River, Panama.

icropyle. It was originally discovered by Treub in Casuarina, and has since been found to occur regularly in the families Betulaceæ and Juglandaceæ. Partial chalazogamy is found in Ulmus, the tube here penetrating the nucleus midway between the chalaza and micropyle. --Chal`a*zo*gam"ic (#), a.

es, or yellow copper ore; a common ore of opper, containing copper, iron, and sulphur. It occurs massive and in tetragonal crystals of a bright brass yellow color.

ed forces; the issue of uncertain conditions; an event not calculated upon; an unexpected occurrence; a happening; accident; fortuity; casualty. It was a chance that happened to us. 1 Sam. vi. 9. The Knave of Diamonds tries his wily arts, And wins (O shameful chance!) the Queen of Hearts. Pope. I spake of most disastro…

d in the life of a woman when menstruation and the capacity for conception cease, usually occurring between forty-five and fifty years of age. -- Change ringing, the continual production, without repetition, of changes on bells, See def. 9. above. -- Change wheel (Mech.), one of a set of wheels of different sizes and…

nds by energy derived from chemical changes or reactions. Chemosynthesis of carbohydrates occurs in the nitrite bacteria through the oxidation of ammonia to nitrous acid, and in the nitrate bacteria through the conversion of nitrous into nitric acid. -- Chem`o*syn*thet"ic (#), a.

d only in cells exposed to the light. Chloroplasts are minute flattened granules, usually occurring in great numbers in the cytoplasm near the cell wall, and consist of a colorless ground substance saturated with chlorophyll pigments. Under light of varying intensity they exhibit phototactic movements. In animals chlor…

adic cholera, a disease somewhat resembling the Asiatic cholera, but originating where it occurs, and rarely becoming epidemic.

A fluosilicate of magnesia and iron, yellow to red in color, often occurring in granular form in a crystalline limestone.

A painful erection of the penis, usually with downward curvature, occurring in gonorrhea.

A comparatively rare element occurring most abundantly in the mineral chromite. Atomic weight 52.5. Symbol Cr. When isolated it is a hard, brittle, grayish white metal, fusible with difficulty. Its chief commercial importance is for its compounds, as potassium chromate, lead chromate, etc., which are brilliantly colore…

A hydrous silicate of copper, occurring massive, of a blue or greenish blue color.

Red sulphide of mercury, occurring in brilliant red crystals, and also in red or brown amorphous masses. It is used in medicine.

To occur at the same time; to be contemporaneous; as, the fall of Granada coincided with the discovery of America.

A hydrous borate of lime occurring in transparent colorless or white crystals, also massive, in Southern California.