sea-bean

from The Century Dictionary.

• noun The seed of a leguminous climbing plant, Entada scandens, growing in the tropics of both hemispheres, and remarkable for the size of its pods. (See similarpod.)
• noun One of numerous different species of small univalve shells of the family Triviidæ, as Trivia pediculus of the West Indies, T. californica, etc.
• noun The operculum or lid of the aperture of any shell of the family Turbinidæ, as the common Turbo pharaonis of the East Indies.