SINCE 1828
hydrospire
noun
hy·dro·spire
| \ "+ˌ-\
Definition of hydrospire
: a flattened calcareous pouch or tube on either side of the middle line of the inner surface of the ambulacra of a blastoid, located within the cavity of the calyx, opening on the exterior by a small aperture, and presumed to form part of the respiratory system
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