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The Collaborative International Dictionary
Nicker 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.]

Wiktionary
nicker nut

alt. The rounded seed of the nicker tree. n. The rounded seed of the nicker tree.

WordNet
nicker nut

n. hard shiny gray seed of a bonduc tree; used for making e.g. jewelry [syn: bonduc nut, nicker seed]