Rhabdolith
Pronunciation : Rhab"do*lith
Part of Speech : n.
Etymology : [Gr. "ra`bdos a rod + -lith.]
Definition : Defn: A minute calcareous rodlike structure found both at the surface and the bottom of the ocean; -- supposed by some to be a calcareous alga.
Source : Webster's Unabridged Dictionary, 1913