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cœnosteum

cœnosteum Zool.
  (siːˈnɒstɪəm)
  [f. Gr. κοιν-ός common + ὀστέον bone.]
  The common calcareous skeleton of the Hydrocorallina, a division of the Hydrozoa, as of millepore coral.

1880 Moseley Zool. Challenger Exped. vii. 12 The hard tissue is here termed cœnosteum to distinguish it from the Anthozoan corallum. 1888 Rolleston & Jackson Anim. Life 776 Stylasteridae: Coenosteum arborescent.

Oxford English Dictionary

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