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The outer or superficial part of an organ; as, the cortex or gray exterior substance of the brain.

of, bark or rind; resembling bark or rind; external; outer; superficial; as, the cortical substance of the kidney.

thyst, or purple sapphire; and adamantine spar, the hair-brown variety. It is the hardest substance found native, next to the diamond.

A substance obtained from the residues of the distillation of petroleum, essentially the same as vaseline, but of somewhat stiffer consistency, and consisting of a mixture of the higher paraffines; a kind of petroleum jelly.

A white, crystalline substance, C12H13NO3, obtained as a product of the decomposition of narcotine. It has weak basic properties, and is usually regarded as an alkaloid.

A soft, downy substance, resembling fine wool, consisting of the unicellular twisted hairs which grow on the seeds of the cotton plant. Long-staple cotton has a fiber sometimes almost two inches long; short-staple, from two thirds of an inch to an inch and a half.

matic acids, related to cinnamic acid, the most important of which is a white crystalline substance, HO.C6H4.C2H2.CO2H, obtained from the tonka bean, sweet clover, etc., and also produced artifically.

ouna) odorata and consisting essentially of coumarin proper, which is a white crystalline substance, C9H6O2, of vanilla- like odor, regarded as an anhydride of coumaric acid, and used in flavoring. Coumarin in also made artificially.

y, as a design or painting, by tracing with a pencil on oiled paper, or other transparent substance.

Sticking plaster made by coating taffeta or silk on one side with some adhesive substance, commonly a mixture of isinglass and glycerin.

A small, narrow opening, fissure, crevice, or chink, as in a wall, or other substance. In a firm building, the cavities ought not to be filled with rubbish, but with brick or stone fitted to the crannies. Dryden. He peeped into every cranny. Arbuthnot.

To make a prolonged sharp grating or ssqueaking sound, as by the friction of hard substances; as, shoes creak. The creaking locusts with my voice conspire. Dryden. Doors upon their hinges creaked. Tennyson.

the liquor in the process of purification by recrystallization. It is a white crystalline substance, with a gritty acid taste, and is used very largely as an ingredient of baking powders; -- called also potassium bitartrate, acid potassium tartrate, etc.

A line or mark made by folding or doubling any pliable substance; hence, a similar mark, howewer produced.

A white, crystalline, nitrogenous substance found abundantly in muscle tissue. [Written also kreatine.]

Cream; a substance resembling cream; yeast; scum.

Any one of three metameric substances, CH3.C6H4.OH, homologous with and resembling phenol. They are obtained from coal tar and wood tar, and are colorless, oily liquids or solids.

A vessel or melting pot, composed of some very refractory substance, as clay, graphite, platinum, and used for melting and calcining substances which require a strong degree of heat, as metals, ores, etc.

he nature of crust; pertaining to a hard covering; as, a crusty coat; a crusty surface or substance.

A substance, as salt, ammonium chloride, etc., which crystallizes with water of crystallization only at low temperatures, or below the freezing point of water. F. Guthrie.