ICLE. A northern name for the viviparous blenny.

DORRA. From the Gaelic _dorga_; a crab-net.

DORSAL FIN. The median fin placed upon the back of fishes.

DORY. A fish, _Zeus faber_, commonly known as "John Dory," or truly
_jaune doree_, from its golden hues.

DOTTLE. The small portion of tobacco remaining unsmoked in the pipe.

DOUBLE, TO. To cover a ship with an extra planking, usually of 4 inches,
either internally or externally, when through age or otherwise she has
become loosened; the process strengthens her without driving out the
former fastenings. Doubling, however, is a term applied only where the
plank thus used is not less than 2 inches thick.--To _double_ a cape.
(_See_ DOUBLING A CAPE.)

DOUBLE-ACTING ENGINE. One in which the steam acts upon the piston
against a vacuum, both in the upward and downward movement.

DOUBLE-BANK A ROPE, TO. To clap men on both sides.

DOUBLE-BANKED. When two opposite oars are pulled by rowers seated on the
same thwart; or when there are two men labouring upon each oar. Also,
60-gun frigates which carry guns along the gangway, as was the custom
with Indiamen, are usually styled _double-bankers_.

DOUBLE-BITTED. Two turns of the cable round the bitts instead of one.

DOUBLE-BLOCK. One fitted with a couple of sheaves, in holes side by
side.

DOUBLE-BREECHING. Additional breeching on the non-recoil system, or
security for guns in heavy weather.

DOUBLE-CAPSTAN. One shaft so constructed as to be worked both on an
upper and lower deck, as in ships of the line, or in Phillips' patent
capstan.

DOUBLE-CROWN. A name given to a plait made with the strands of a rope,
which forms part of several useful and ornamental knots.

DOUBLE DECK-NAILS. _See_ DECK-NAILS.

DOUBLE DUTCH COILED AGAINST THE SUN. Gibberish, or any unintelligible or
difficult language.

DOUBLE EAGLE. A gold coin of the United States, of 10 dollars; value L2,
1_s._ 8_d._, at the average rate of exchange.

DOUBLE-FUTTOCKS. Timbers in the cant-bodies, extending from the
dead-wood to the run of the second futtock-head.

DOUBLE-HEADED MAUL. One with double faces; top-mauls in
contradistinction to pin-mauls.

DOUBLE-HEADED SHOT. Differing from bar-shot by being similar to
dumb-bells, only the shot are hemispherical.

DOUBLE-IMAGE MICROMETER. Has one of its lenses divided, and separable to
a certain distance by a screw, which at the same time moves an index
upon a graduated scale. When fitted to a telesc