The Collaborative International Dictionary of English v.0.48:

Astraean \As*tr[ae]"an\, a. [Gr. ? starry.] (Zool.)
   Pertaining to the genus Astr[ae]a or the family
   Astr[ae]id[ae]. -- n. A coral of the family
   Astr[ae]id[ae]; a star coral.
   [1913 Webster]