The Collaborative International Dictionary
neckar nut
Nicker nut \Nick"er 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 C[ae]salpinia. C[ae]salpinia Bonduc has yellowish seeds; C[ae]salpinia Bonducella, bluish gray. [Spelt also neckar nut, nickar nut.]