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ooked spirally; subjected to torsion; hence, perverted. Twisted curve (Geom.), a curve of double curvature. See Plane curve, under Curve. -- Twisted surface (Geom.), a surface described by a straight line moving according to any law whatever, yet so that the consecutive positions of the line shall not be in one plane;…

Consisting of two thicknesses, as cloth; double.

Having two sides only; hence, double-faced; hypocritical.

Double-tongued; deceitful. Sandys.

Double; duplicate; multiplied by two; as, a twofold nature; a twofold sense; a twofold argument.

mes of old renown . . . abused Fanatic Egypt. Milton. Mr. Duke may be mentioned under the double capacity of a poet and a divine. Felton. Under this head may come in the several contests and wars betwixt popes and the secular princes. C. Leslie.

Having but one optic axis, or line of no double refraction.

(Fig. 1). Since this joint can not act when the angle of the shafts is less than 140º, a double joint of the same kind is sometimes used for giving rotary motion at angles less than 140º (Fig. 2). -- Universal umbel (Bot.), a primary or general umbel; the first or largest set of rays in a compound umbel; -- opposed t…

the upper class; the aristocracy. [Colloq.] -- Upper topsail (Naut.), the upper half of a double topsail. -- Upper works (Naut.), all those parts of the hull of a vessel that are properly above water. -- Upper world. (a) The atmosphere. (b) Heaven. (c) This world; the earth; -- in distinction from the underworld.…

ries, when a bill of exchange is payable; as, a bill drawn on London at one usance, or at double usance.

lve shells. Air valve, Ball valve, Check valve, etc. See under Air. Ball, Check, etc. -- Double-beat valve, a kind of balance valve usually consisting of a movable, open-ended, turban-shaped shell provided with two faces of nearly equal diameters, one above another, which rest upon two corresponding seats when the val…

covering to give a fair appearance to any act or conduct; outside show; gloss. And set a double varnish on the fame The Frenchman gave you. Shak. Varnish tree (Bot.), a tree or shrub from the juice or resin of which varnish is made, as some species of the genus Rhus, especially R. vernicifera of Japan. The black varni…

can not be foreseen with certainty; a hazard; a risk; a speculation. I, in this venture, double gains pursue. Dryden.

g strings tuned an octave below those of the violoncello; the contrabasso; -- called also double bass. [Written also violono.]

o establish his warranty of title. In common recoveries, there may be a single voucher or double vouchers. Blackstone.

f the second and through the bight of the first; a wale knot. Wall knots may be single or double, crowned or double-crowned.

h flowers, etc. -- Watch tackle (Naut.), a small, handy purchase, consisting of a tailed double block, and a single block with a hook.

A plate heated by hot water contained in a double bottom or jacket. Knight.

e surface of light in the interior of crystals. It is used in explaining the phenomena of double refraction. See under Refraction. -- Wave theory. (Physics) See Undulatory theory, under Undulatory.

A grayish, coarse double blanket worn by countrywomen, in the west of England, over the shoulders, like a cloak or shawl. C. Kingsley.