JACKASS
Jack"ass`, n. Etym: [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. Etym: [Prob. 2d jack + daw, n.] (Zoöl.)
Defn: See Daw, n.
JACKEEN
Jack*een", n.
Defn: A drunken, dissolute fellow. [Ireland] S. C. Hall.
JACKET
Jack"et, n. Etym: [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.