American Dictionary of the English Language

TRO'CHITE, noun [Latin trochus; Gr. to run.]

1. In natural history, a kind of figured fossil stone, resembling parts of plants, called St. Cuthbert's beads. These stones are usually of a brownish color; they break like spar, and are easily dissolved in vinegar. Their figure is generally cylindrical, sometimes a little tapering. Two, three or more of these joined, constitute an entrochus.

2. Fossil remains of the shells called trochus.