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An iron-black ore of silver, consisting of silver, sulphur, and antimony, with some copper and arsenic.

reviously required; necessary as a preliminary to any proposed effect or end; as, prerequisite conditions of success.

neral of an iron-black or dark steel- gray color and metallic luster, usually soft. Pyrolusite parts with its oxygen at a red heat, and is extensively used in discharging the brown and green tints of glass (whence its name).

quired, or is necessary; something indispensable. God, on his part, has declared the requisites on ours; what we must do to obtain blessings, is the great business of us all to know. Wake.

Manganese carbonate, a rose-red mineral sometimes occuring crystallized, but generally massive with rhombohedral cleavage like calcite; -- called also dialogite.

A mineral occurring in steel-gray flexible folia. It contains iron, nickel, and phosphorus, and is found only in meteoric iron.

action originating in one's self or in itself. These molecular blocks of salt are self-posited. Tyndall.

To flatter; to cajole; to act the parasite. [Obs.] Dr. R. Clerke.

A light cape or short cloak of silk or lace worn by women in summer.

A visitor.

A variety of allanite from Sweden supposed to contain wasium.

A grayish or whitish mineral occurring in orthorhombic, prismatic crystals, also in columnar masses. It is a silicate of alumina and lime, and is allied to epidote.

Pertaining to the surface or end opposite to the mouth in a radiate animal; -- opposed to actinal. "The aboral or abactinal area." L. Agassiz.

(a) The relinquishment of a right, claim, or privilege, as to mill site, etc. (b) The voluntary leaving of a person to whom one is bound by a special relation, as a wife, husband, or child; desertion.

On the beam, that is, on a line which forms a right angle with the ship's keel; opposite to the center of the ship's side.

A pathological condition opposite to that of irritation; debility; want of strength; asthenia.

Situated opposite to, or away from, the mouth.

To a reserved position; half round; in the opposite direction; on the opposite tack; as, to face about; to turn one's self about. To bring about, to cause to take place; to accomplish. -- To come about, to occur; to take place. See under Come. -- To go about, To set about, to undertake; to arrange; to prepare. "Shall…

Side by side; also, opposite; over against; on a line with the vessel's beam; -- with of.

s of the acanthus (Acanthus spinosus); -- used in the capitals of the Corinthian and Composite orders.