Meaning of pisolith

pis•o•lith

Pronunciation: (pis'u-lith, piz'-, pī'su-), [key]
— n.
  1. a pea-size calcareous concretion, larger than an oolith, aggregates of which constitute a pisolite.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.