“+ˌ- noun
Etymology: hydr- + spire (coil)
: 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
• hy·dro·spi·ric | ̷ ̷ ̷ ̷|spīrik adjective