from the GNU version of the Collaborative International Dictionary of English
- n. Any one of several species of handsome marine gastropod shells of the genus Trochus, or Imperator. The shell is conical, with the margin toothed somewhat like the rowel of a spur.
from The Century Dictionary and Cyclopedia
- n. A shell of the genus Imperator (formerly called Calcar): so named from its resemblance to the rowel of a spur. The term extends to some similar trochiform shells. See cut under
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