English Alternative forms sea girkin Noun sea gherkin (plural sea gherkins) Any of a number of small holothurians resembling in form a gherkin, especially Pawsonia saxicola. Hypernyms sea cucumber References “sea gherkin”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC. Wikiwand - on Seamless Wikipedia browsing. On steroids.