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Meaning of pneumatocyst

pneu•mat•o•cyst

Pronunciation: (noo-mat'u-sist, nyoo-, n'mu-tu-, ny'), [key]
— n. Biol.
  1. the cavity of a pneumatophore.
  2. pneumatophore.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.