Kiar
From Simon Online
Kiar arabice vel kaiar cucumer vel citrulus.
Translation:
Kiar or kaiar is the Arabic word for Latin cucumer {"cucumber"} or citrulus {"water melon"}.
Commentary:
Wehr (1976): خيار/ ḫiyār/ "cucumber". Siggel (1950: 33): خيار /ḫiyār/ Cucumis sativa (Cucurbitac.), Gurke {i.e. "cucumber"}