Chapter J to Jackknife of J by Webster's Dictionary (1913 Edition)

Jack-a-lent
(Jack"-a-lent) n. A small stuffed puppet to be pelted in Lent; hence, a simple fellow.

Jackanapes
(Jack"a*napes) n. [For Jack o' (= of) apes; prop., a man who exhibits apes.] [Written also jackanape.]

1. A monkey; an ape. Shak.

2. A coxcomb; an impertinent or conceited fellow.

A young upstart jackanapes.

Arbuthnot.

Jackass
(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.

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

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

Jacket
(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.]

Jacket
(Jack"et), v. t.

1. To put a jacket on; to furnish, as a boiler, with a jacket.

2. To thrash; to beat. [Low]

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

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