It is technically a fruit
onions okra oranges olives
cucumbers are a fruit...they contain seeds, just like tomatoes.
if It has seeds its a fruit. That's the rule. (yes even pumpkins) All cucumbers and squashes (all members of the 'Cucurbit' family) are fruits.
Fruit
cucumber is a vegetableTechnically, it's a fruit since it has the seed of the plant.