The Collaborative International Dictionary of English v.0.48:

Blastocarpous \Blas`to*car"pous\, a. [Gr. ? sprout, germ + ?
   fruit.] (Bot.)
   Germinating inside the pericarp, as the mangrove. --Brande &
   C.
   [1913 Webster] Blastocoele
   blastocoel