1. the berrylike fruit of either of two African shrubs, Synsepalum dulcificum or Thaumatococcus daniellii, that, when chewed, causes sour substances to taste sweet.
2. Also called serendipity berry. the similar fruit of an African shrub, Dioscoreophyllum cumminsii. Also called mir'acle ber"ry, miraculous fruit.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.