English English Wikipedia has an article on:sea cradleWikipedia Noun sea cradle (plural sea cradles) A chiton (kind of marine mollusc). 1945, John Steinbeck, Cannery Row:All the articles of his trade were filed away on the coast, sea cradles here, octopi here, tubs worms in another place, sea pansies in another.Wikiwand - on Seamless Wikipedia browsing. On steroids.