porphyry shell

English

Noun

porphyry shell (plural porphyry shells)

  1. The shell of a particular marine gastropod known as the tent olive (Oliva porphyria), having a dark red or brown polished surface, marked with light spots, like porphyry.

References
  • porphyry in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913
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