*nicker nut*

A rounded seed, rather smaller than a nutmeg, having a hard smooth shell, and a yellowish or bluish color. The seeds grow in the prickly pods of tropical, woody climbers of the genus Caesalpinia. Caesalpinia Bonduc has yellowish seeds; Caesalpinia Bonducella, bluish gray. [ Spelt also neckar nut, nickar nut. ] [ 1913 Webster ]