Wilson's Dictionary of Bible Types
Isaiah 1:8 (b) This vegetable is used by the prophet to remind Israel that their heart's desire had led them into a life of worthless, useless activity such as they had experienced in Egypt. Cucumbers have no food value, and were one of the principle foods in Egypt. GOD let them have their desire and sent leanness into their souls.
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Watson, Walter. Entry for 'Cucumber'. Wilson's Dictoinary of Bible Types. https://www.studylight.org/dictionaries/eng/wdt/c/cucumber.html. 1957.