Definition of spirifer
1 capitalized : a large genus (the type of the family Spiriferidae) of articulate brachiopods that have the arms supported within the shell by long spirally coiled spiralia which form a pair of cones with their apexes directed more or less laterally toward the ends of the long hinge line and that abound in Silurian, Devonian, and Carboniferous formations
2 or spiriferid \spīˈrifərə̇d\ plural -s [spiriferid from New Latin Spiriferidae family of brachiopods, from Spirifer, type genus + -idae] : any brachiopod of Spirifer or a related genus —called also spire-bearer
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Origin and Etymology of spirifer
New Latin, from spir- + -fer
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