Spur″–shell′ (spûr″shĕl′), n.(Zoöl.) 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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.