Part 418

A young upstart jackanapes.

Arbuthnot.

Jack"ass` (?), n. [2d jack + ass.]

1. The male ass; a donkey.

2. A conceited dolt; a perverse blockhead.

Jackass bark (Naut.), a three-masted vessel, with only the foremast square-rigged; a barkentine. -- Jackass deer (Zoöl.), the koba. -- Jackass hare, Jackass rabbit (Zoöl.). See Jack rabbit, under 2d Jack, n. -- Jackass penguin (Zoöl.), any species of penguin of the genus Spheniscus, of which several are known. One species (S. demersus) inhabits the islands near the Cape of Good Hope; another (S. Magellanicus) is found at the Falkland Islands. They make a noise like the braying of an ass; -- hence the name. -- Laughing jackass. (Zoöl.) See under Laughing.

Jack"daw` (?), n. [Prob. 2d jack + daw, n.] (Zoöl.) See Daw, n.

Jack*een" (?), n. A drunken, dissolute fellow. [Ireland] S. C. Hall.

Jack"et (?), n. [F. jaquette, dim. of jaque. See 3d Jack, n.]

1. A short upper garment, extending downward to the hips; a short coat without skirts.

2. An outer covering for anything, esp. a covering of some nonconducting material such as wood or felt, used to prevent radiation of heat, as from a steam boiler, cylinder, pipe, etc.

3. (Mil.) In ordnance, a strengthening band surrounding and reënforcing the tube in which the charge is fired.

4. A garment resembling a waistcoat lined with cork, to serve as a life preserver; -- called also cork jacket.

Blue jacket. (Naut.) See under Blue. -- Steam jacket, a space filled with steam between an inner and an outer cylinder, or between a casing and a receptacle, as a kettle. -- To dust one's jacket, to give one a beating. [Colloq.]

Jack"et, v. t. 1. To put a jacket on; to furnish, as a boiler, with a jacket.

2. To thrash; to beat.

Jack"et*ed, a. Wearing, or furnished with, a jacket.

Jack"et*ing, n. The material of a jacket; as, nonconducting jacketing.

Jack" Ketch" (?). [Perh. fr. Jack, the proper name + Prov. E. ketch a hangman, fr. ketch, for catch to seize; but see the citations below.] A public executioner, or hangman. [Eng.]

The manor of Tyburn was formerly held by Richard Jaquett, where felons for a long time were executed; from whence we have Jack Ketch.

Lloyd's MS., British Museum.

Macaulay.

Jack"knife` (?), n. A large, strong clasp knife for the pocket; a pocket knife.

Jack"man (?), n.; pl. Jackmen (&?;).

1. One wearing a jack; a horse soldier; a retainer. See 3d Jack, n.

Christie . . . the laird's chief jackman.

Sir W. Scott.

2. A cream cheese. [Obs.] Sir T. Elyot.