(historical, folklore) A terrifying man of bizarre appearance and able to make extraordinary leaps, the subject of English folklore of the Victorian era.

(card games, slang) Either card of the rank of jack commonly depicted in the frontal view of the jack of diamonds or jack of clubs.

(nautical, slang, obsolete) A sailor.

plural of Jack Nasty-Face

Trachurus japonicus, of the fish family Carangidae,

(card games) Synonym of beggar-my-neighbor

plural of jack-o-lantern

Alternative spelling of jack-o'-lantern

Either of the bedrooms of a Jack and Jill suite.

The bathroom of a Jack and Jill suite.