n. & v.
n. 1 a a sleeved short outer garment. b a thing worn esp. round the torso for protection or support (life-jacket). 2 a casing or covering, e.g. as insulation round a boiler. 3 = dust-jacket. 4 the skin of a potato, esp. when baked whole. 5 an animal's coat.
v.tr. (jacketed, jacketing) cover with a jacket. jacket potato a baked potato served with the skin on.
[ ME f. OF ja(c)quet dimin. of jaque JACK(2) ]