The phrase "raw cucumber" refers to a cucumber that has not been cooked or processed in any way. It basically means a plain, fresh cucumber that is in its natural state. Full definition
Raw cucumber slices can be placed on the skin to reduce inflammation from causes such as acne and sunburn. (herbazest.com)
A bowl of salted ice water ensures blanched vegetables stay tender - crisp while making raw cucumbers and radishes wonderfully crunchy and refreshing. (epicurious.com)
I had in fact never heard of such a thing as raw cucumber kimchi. (parsleyvegan.com)