The Collaborative International Dictionary
Sea gherkin
Sea gherkin \Sea" gher`kin\, or Sea girkin \Sea" gir"kin\ (Zo["o]l.) Any small holothurian resembling in form a gherkin.
Wiktionary
sea gherkin
alt. Any small holothurian resembling in form a gherkin. n. Any small holothurian resembling in form a gherkin.