Source : Webster's Revised Unabridged Dictionary (1913)

Blastocoele \Blas"to*c[oe]le\, n. [Gr. blasto`s sprout + koi^los
   hollow.] (Biol.)
   The cavity of the blastosphere, or segmentation cavity.

Source : WordNet®

blastocoele
     n : the fluid-filled cavity inside a blastula [syn: {blastocoel},
          {blastocele}, {segmentation cavity}, {cleavage cavity}]