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A deposition, esp. an excessive deposition, of coloring matter; as, pigmentation of the liver.

h a thin plate of precious or bright metal, as by mechanical means or by electro-magnetic deposition.

d upon the plates of a voltaic battery, or the electrodes in an electrolytic cell, by the deposition upon them of the gases liberated by the action of the current. It is chiefly due to the hydrogen, and results in an increase of the resistance, and the setting up of an opposing electro-motive force, both of which tend…

often premature mental faculties. The essential cause of the disease appears to be the nondeposition of earthy salts in the osteoid tissues. Children afflicted with this malady stand and walk unsteadily. Called also rachitis.

Subsequent in origin; -- said of minerals produced by alteertion or deposition subsequent to the formation of the original rocks mass; also of characters of minerals (as secondary cleavage, etc.) developed by pressure or other causes.

The act of depositing a sediment; specifically (Geol.), the deposition of the material of which sedimentary rocks are formed.

name to various minerals. Calcareous sinter, a loose banded variety of calcite formed by deposition from lime-bearing waters; calcareous tufa; travertine. -- Ceraunian sinter, fulgurite. -- Siliceous sinter, a light cellular or fibrous opal; especially, geyserite (see Geyserite). It has often a pearly luster, and is…

t. Stalactites are found depending from the roof or sides of caverns, and are produced by deposition from waters which have percolated through, and partially dissolved, the overlying limestone rocks.

The deposition of material in successive layers in the growth of a cell wall, thus giving rise to a stratified appearance.

A soft or porous stone formed by depositions from water, usually calcareous; -- called also calcareous tufa.

welling, prominence, or growth, on any part of the body; especially, a growth produced by deposition of new tissue; a neoplasm.

rvening partitions, and are usually marked with dots, pits, rings, or spirals by internal deposition of secondary membranes; a duct. Acoustic vessels. See under Acoustic. -- Weaker vessel, a woman; -- now applied humorously. "Giving honor unto the wife, as unto the weaker vessel." 1 Peter iii. 7. "You are the weaker v…

A depression in coal strata, hollowed out before the subsequent deposition took place. [Eng.]

characters, and advocated the theory that the strata of the earth's crust were formed by depositions from water; designating, or according to, Werner's system.