Definition of sea bean
1a : any of various beans or showy seeds of tropical origin that are frequently carried by ocean currents to remote shores and often used as ornaments: such as (1) : the large chocolate-colored seed of a snuffbox bean used in poultices and as an emetic (2) : oxeye bean (3) : nicker nut b : a plant producing sea beans
2 : the hard flat rounded calcareous operculum of any of various mollusks (as those of the family Turbinidae)
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