Pierre-perdu
Pronunciation : Pierre`-per`du"
Part of Speech : n.
Definition : Defn: Blocks of stone or concrete heaped loosely in the water to make a foundation (as for a sea wall), a mole, etc.
[F. pierre perdue lost stone.]
Source : Webster's Unabridged Dictionary, 1913
Merriam-Webster's Everyday Language Reference Set: Includes: The Merriam-Webster Dictionary, The Merriam-Webster Thesaurus, and The Merriam-Webster Vocabulary Builder