Is it ensure, insure, or assure?
late 14c., "date-like fruit from a tree found in Asia," from Medieval Latin jujuba (plural), from Late Latin zizyphum, from zizyphus, an Asiatic tree with datelike fruit, from Greek zizyphon, from Persian zayzafun. The meaning "soft candy with date-like flavor" first recorded 1835.
either of two species of small, spiny trees of the genus Ziziphus (family Rhamnaceae) and their fruit. Most are varieties of the common jujube (Z. jujuba), native to China, where they have been cultivated for more than 4,000 years. This species, 7.6 to 9 m (25 to 30 feet) high, has alternate, three-veined, elliptical to ovate leaves 2.5 to 7.6 cm (1 to 3 inches) long. The small yellow flowers are followed by dark brown, round to oblong fruits the size of small plums. The white, crisp pulp surrounds a single large, pointed stone