GNU Collaborative International Dictionary of English

Found one definition

      
Spirifer , n. [NL., fr. L. spira a coil + ferreto bear.] (Paleon.) Any one of numerous species of fossil brachipods of the genus Spirifer, or Delthyris, and allied genera, in which the long calcareous supports of the arms form a large spiral, or helix, on each side.
1913 Webster

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