Molucca bean
/məˈlʌkə biːn/noun
Any of several kinds of tropical seed found stranded on beaches, especially in western Europe; specifically that of either of two leguminous trees, the yellow nicker, Caesalpinia bonduc, and the sword-bean, Entada gigas (both of the family Fabaceae (Leguminosae)).
Origin
Late 17th century; earliest use found in Philosophical Transactions of the Royal Society of London. From Molucca + bean.