from
The Collaborative International Dictionary of English v.0.48
Jigger \Jig"ger\, n. [See {Jig}, n. & v.]
1. One who, or that which, jigs; specifically, a miner who
sorts or cleans ore by the process of jigging; also, the
sieve used in jigging.
[1913 Webster]
2. (Pottery)
(a) A horizontal table carrying a revolving mold, on which
earthen vessels are shaped by rapid motion; a potter's
wheel.
(b) A template or tool by which vessels are shaped on a
potter's wheel.
[1913 Webster]
3. (Naut.)
(a) A light tackle, consisting of a double and single
block and the fall, used for various purposes, as to
increase the purchase on a topsail sheet in hauling it
home; the watch tackle. --Totten.
(b) A small fishing vessel, rigged like a yawl. [New Eng.]
(c) A supplementary sail. See {Dandy}, n., 2
(b) .
[1913 Webster]
4. A pendulum rolling machine for slicking or graining
leather; same as {Jack}, 4
(i) .
[1913 Webster]
5. A small glass or measuring vessel holding 11/2 ounces (45
ml), used mostly for measuring liquor or drinking whiskey;
also, the quantity of liquid held in a jigger.
[PJC]
6. A {thingamajig}. [Colloq.]
[PJC]
{Jigger mast}. (Naut.)
(a) The after mast of a four-masted vessel.
(b) The small mast set at the stern of a yawl-rigged boat.
[1913 Webster]