Jam nut. See Check nut, under Check.Jam weld(Forging), a butt weld. See under Butt.

(||Jam`a*ci"na) n. [NL.] Jamaicine.

(||Jam"a*dar) n. Same as Jemidar.

(Ja*mai"ca) n. One of the West India islands.

Jamaica ginger, a variety of ginger, called also white ginger, prepared in Jamaica from the best roots, which are deprived of their epidermis and dried separately.Jamaica pepper, allspice.Jamaica rose(Bot.), a West Indian melastomaceous shrub with showy pink flowers.

(Ja*mai"can) a. Of or pertaining to Jamaica.n. A native or inhabitant of Jamaica.

(Ja*ma"i*cine) n. [From Jamaica.] (Chem.) An alkaloid said to be contained in the bark of Geoffroya inermis, a leguminous tree growing in Jamaica and Surinam; — called also jamacina. Watts.

(Jamb) n. [Prov. E. jaumb, jaum, F. jambe a leg, jambe de force a principal rafter. See Gambol.]

1. (Arch) The vertical side of any opening, as a door or fireplace; hence, less properly, any narrow vertical surface of wall, as the of a chimney-breast or of a pier, as distinguished from its face. Gwilt.

2. (Mining) Any thick mass of rock which prevents miners from following the lode or vein.

(Jamb) v. t. See Jam, v. t.

(Jam*bee") n. [See Jamb, n.: cf. OF. jamboier to walk.] A fashionable cane. [Obs.] Tatler.

(Jambes Jam"beux) n. pl. [From F. jambe a leg: cf. OF. jambiere. See Jamb, n.] (Ancient Armor) In the Middle Ages, armor for the legs below the knees. [Written also giambeux.] Chaucer.

(||Jam`bo*la"na) n. [Cf. Pg. jambolão a kind of tropical fruit.] (Bot.) A myrtaceous tree of the West Indies and tropical America with astringent bark, used for dyeing. It bears an edible fruit.

(||Jam"da*ni) n. A silk fabric, with a woven pattern of sprigs of flowers. [Written also jamdanee.] Balfour

(Ja"me*son*ite) n. [From Prof. Jameson, of Edinburgh.] (Min.) A steel-gray mineral, of metallic luster, commonly fibrous massive. It is a sulphide of antimony and lead, with a little iron.

James's powder
(James"'s pow`der) (Med.) Antimonial powder, first prepared by Dr. James, an English physician; — called also fever powder.

3. (Naut.) To bring (a vessel) so close to the wind that half her upper sails are laid aback. W. C. Russell.

(Jam), n.

1. A mass of people or objects crowded together; also, the pressure from a crowd; a crush; as, a jam in a street; a jam of logs in a river.

2. An injury caused by jamming. [Colloq.]

(Jam), n. [Prob. fr. jam, v.; but cf. also Ar. jamad ice, jelly, jamid congealed, jamd congelation, ice.] A preserve of fruit boiled with sugar and water; as, raspberry jam; currant jam; grape jam.

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