Small, Hard Piece of Excess Bile Material

This page is the CodyCross answer for the clue below from Forests, Group 1987, Puzzle 3 (Natural Resources).

Question is: Small, Hard Piece of Excess Bile Material

and the answer is: GALLSTONE

Word Meaning:

GALLSTONE — (biology, medicine) A small, hard object, in the shape of a pebble, that sometimes forms in the gallbladder or bile duct; composed of cholesterol, bile pigments and calcium salts.

Definitions from Wiktionary.