Search the Dictionary

A sulphide of antimony and silver of an iron-black color and metallic luster; called also black silver, and brittle silver ore.

A mineral of a lead-gray color and brilliant metallic luster, occurring in prismatic crystals; sulphide of antimony; -- called also antimony glance, and gray antimony.

A small, filamentous ramification of a metallic vein. Ure.

A steel-gray mineral of metallic luster. It is a sulphide of silver and copper.

A metallic element of the calcium group, always naturally occurring combined, as in the minerals strontianite, celestite, etc. It is isolated as a yellowish metal, somewhat malleable but harder than calcium. It is chiefly employed (as in the nitrate) to color pyrotechnic flames red. Symbol Sr. Atomic weight 87.3. A rad…

em.), a compound of two sulphides. -- Hydrogen sulphide. (Chem.) See under Hydrogen. -- Metallic sulphide, a binary compound of sulphur with a metal.

A nonmetallic element occurring naturally in large quantities, either combined as in the sulphides (as pyrites) and sulphates (as gypsum), or native in volcanic regions, in vast beds mixed with gypsum and various earthy materials, from which it is melted out. Symbol S. Atomic weight 32. The specific gravity of ordinary…

r is deep violet, or nearly black, with brilliant green reflections. The gorget is bright metallic green. -- Superb warber. (Zoöl.) See Blue wren, under Wren. -- Su*perb"ly, adv. -- Su*perb"ness, n.

A metallic binding, tube, or point, at the end of a string, or lace, to stiffen it.

A shallow metallic cup or drum, with a thin elastic membrane supporting a writing lever. Two or more of these are connected by an India rubber tube, and used to transmit and register the movements of the pulse or of any pulsating artery.

A heavy mineral of an iron-black color and submetallic luster. It is essentially a tantalate of iron.

A rare nonmetallic element found in certain minerals, as tantalite, samarskite, and fergusonite, and isolated as a dark powder which becomes steel-gray by burnishing. Symbol Ta. Atomic weight 182.0. Formerly called also tantalium.

A tapeline; also, a metallic ribbon so marked as to serve as a tapeline; as, a steel tape. Red tape. See under Red. -- Tape grass (Bot.), a plant (Vallisneria spiralis) with long ribbonlike leaves, growing in fresh or brackish water; -- called also fresh-water eelgrass, and, in Maryland, wild celery. -- Tape needle.…

igmented layer of the choroid coat of the eye in many animals, which has an iridescent or metallic luster and helps to make the eye visible in the dark. Sometimes applied to the whole layer of pigmented epithelium of the choroid.

ssium and basic antimony. It is a poisonous white crystalline substance having a sweetish metallic taste, and used in medicine as a sudorific and emetic.

A rare nonmetallic element, analogous to sulphur and selenium, occasionally found native as a substance of a silver-white metallic luster, but usually combined with metals, as with gold and silver in the mineral sylvanite, with mercury in Coloradoite, etc. Symbol Te. Atomic weight 125.2. Graphic tellurium. (Min.) See S…

A rare metallic element, of uncertain identification, supposed to exist in certain minerals, as gadolinite and samarskite, with other rare ytterbium earth. Symbol Tr or Tb. Atomic weight 150.

A telluride of bismuth. It is of a pale steel-gray color and metallic luster, and usually occurs in foliated masses. Calles also telluric bismuth.

ss, under Word. -- Text letter, a large or capital letter. [Obs.] -- Text pen, a kind of metallic pen used in engrossing, or in writing text-hand.

A rare metallic element of the aluminium group found in some minerals, as certain pyrites, and also in the lead-chamber deposit in the manufacture of sulphuric acid. It is isolated as a heavy, soft, bluish white metal, easily oxidized in moist air, but preserved by keeping under water. Symbol Tl. Atomic weight 203.7.…