nicker nut
noun
nick·er nut
variants or less commonly nicker or nicker-seed or nickar nut
ˈnikə(r)(-)
plural -s
: the very hard shiny gray seed of bonduc (see bonduc sense 2)
Word History
Etymology
nicker, probably from obsolete nicker marble, modification of Dutch knikker, from knikken to crack, snap, from Middle Dutch cnicken, probably of imitative origin like Middle Low German knicken to crack, snap, Middle High German knacken to make a cracking noise