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A double benzene and thiophene nucleus, C8H6S, analogous to naphthalene, and like it the base of a large series of derivatives. [Written also thionaphtene.]

A double thiophene nucleus, C6H4S2, analogous to thionaphthene, and the base of a large series of compounds. [Written also thiophtene.]

drawn out to considerable length; a compound cord consisting of two or more single yarns doubled, or joined together, and twisted.

to expel. -- To thrust through, to pierce; to stab. "I am eight times thrust through the doublet." Shak. -- To thrust together, to compress.

ractive forces of the sun and moon. -- Inferior tide. See under Inferior, a. -- To work double tides. See under Work, v. t. -- Tide day, the interval between the occurrences of two consecutive maxima of the resultant wave at the same place. Its length varies as the components of sun and moon waves approach to, or re…

nsidered with reference to repetition; addition of a number to itself; repetition; as, to double cloth four times; four times four, or sixteen. Summers three times eight save one. Milton.

n playing quick notes on the flute, by striking the tongue against the roof of the mouth; double- tonguing.

A combining form (also used adjectively) designating certain double compounds of titanium with some other elements; as, titano- cyanide, titano-fluoride, titano-silicate, etc.

A complex double tolyl and toluidine derivative of glycocoll, obtained as a white crystalline substance.

A double ear trumpet for estimating the direction from which sounds proceed, esp. for the use of navigators.

m.), the indefinitely small angle between two consecutive osculating planes of a curve of double curvature. -- Moment of torsion (Mech.) the moment of a pair of equal and opposite couples which tend to twist a body. -- Torsion balance (Physics.), an instrument for estimating very minute forces, as electric or magneti…

rees. It constructs a triangular web, or net, usually composed of four radii crossed by a double elastic fiber. The spider holds the thread at the apex of the web and stretches it tight, but lets go and springs the net when an insect comes in contact with it.

a tube in three parts, bent twice upon itself and ending in a bell. The middle part, bent double, slips into the outer parts, as in a telescope, so that by change of the vibrating length any tone within the compass of the instrument (which may be bass or tenor or alto or even, in rare instances, soprano) is commanded.…

A native double salt, consisting of a combination of neutral and acid sodium carbonate, Na2CO3.2HNaCO3.2H2O, occurring as a white crystalline fibrous deposit from certain soda brine springs and lakes; -- called also urao, and by the ancients nitrum.

A racing stroke in which a double over-arm motion is used; -- so called from its use by an amateur named Trudgen, but often erroneously written trudgeon.

ith closed tapered ends by pushing one end within the other, thus making a conical cap of double thickness.

trace one's steps; hence, to drive away; to repel. Shak. -- To turn down. (a) To fold or double down. (b) To turn over so as to conceal the face of; as, to turn down cards. (c) To lower, or reduce in size, by turning a valve, stopcock, or the like; as, turn down the lights. -- To turn in. (a) To fold or double under;…

The double cyanide of ferrous and ferric iron, a dark blue amorphous substance having a coppery luster, used in dyeing, calico printing, etc. Cf. Prussian blue, under Prussian.

Twofold; double. [Obs.]

Double; consisting of two similar and corresponding parts.