Crossword clue: a hard lump produced by the concretion of mineral salts; found in hollow organs or ducts of the body

The most common answer is calculus (8 letters).

1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

Possible answers

calculus 8 letters wn-def

a hard lump produced by the concretion of mineral salts; found in hollow organs or ducts of the body