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Single :: Single (a.) Not doubled, twisted together, or combined with others; as, a single thread; a single strand of a rope..

Iceland Spar :: Iceland spar () A transparent variety of calcite, the best of which is obtained in Iceland. It is used for the prisms of the polariscope, because of its strong double refraction. Cf. Calcite..

Aurocyanide :: Aurocyanide (n.) A double cyanide of gold and some other metal or radical; -- called also cyanaurate.

Double-shade :: Double-shade (v. t.) To double the natural darkness of (a place).

Spindle :: Spindle (n.) A solid generated by the revolution of a curved line about its base or double ordinate or chord.

Chant :: Chant (v. t.) A short and simple melody, divided into two parts by double bars, to which unmetrical psalms, etc., are sung or recited. It is the most ancient form of choral music..

Ivory :: Ivory (n.) The hard, white, opaque, fine-grained substance constituting the tusks of the elephant. It is a variety of dentine, characterized by the minuteness and close arrangement of the tubes, as also by their double flexure. It is used in manufacturing articles of ornament or utility..

Gastraea :: Gastraea (n.) A primeval larval form; a double-walled sac from which, according to the hypothesis of Haeckel, man and all other animals, that in the first stages of their individual evolution pass through a two-layered structural stage, or gastrula form, must have descended. This idea constitutes the Gastraea theory of Haeckel. See Gastrula..

Rackett :: Rackett (n.) An old wind instrument of the double bassoon kind, having ventages but not keys..

Alum :: Alum (n.) A double sulphate formed of aluminium and some other element (esp. an alkali metal) or of aluminium. It has twenty-four molecules of water of crystallization.

Pun :: Pun (v. i.) To make puns, or a pun; to use a word in a double sense, especially when the contrast of ideas is ludicrous; to play upon words; to quibble..

Girder :: Girder (n.) A main beam; a stright, horizontal beam to span an opening or carry weight, such as ends of floor beams, etc.; hence, a framed or built-up member discharging the same office, technically called a compound girder. See Illusts. of Frame, and Doubleframed floor, under Double..

Dynameter :: Dynameter (n.) An instrument for determining the magnifying power of telescopes, consisting usually of a doubleimage micrometer applied to the eye end of a telescope for measuring accurately the diameter of the image of the object glass there formed; which measurement, compared with the actual diameter of the glass, gives the magnifying power..

Doublet :: Doublet (a.) An arrangement of two lenses for a microscope, designed to correct spherical aberration and chromatic dispersion, thus rendering the image of an object more clear and distinct..

Convexo-convex :: Convexo-convex (a.) Convex on both sides; double convex. See under Convex, a..

Hem :: Hem (n.) The edge or border of a garment or cloth, doubled over and sewed, to strengthen raveling..

Double :: Double (a.) Being in pairs; presenting two of a kind, or two in a set together; coupled..

Mackle :: Mackle (v. t. & i.) To blur, or be blurred, in printing, as if there were a double impression..

Double-decker :: Double-decker (n.) A public conveyance, as a street car, with seats on the roof..

Crampoons :: Crampoons (n.) A clutch formed of hooked pieces of iron, like double calipers, for raising stones, lumber, blocks of ice, etc..

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