Source : Webster's Revised Unabridged Dictionary (1913)

Morula \Mor"u*la\, n.; pl. {Morul[ae]}. [NL., dim. of L. morum a
   mulberry.] (Biol.)
   The sphere or globular mass of cells (blastomeres), formed by
   the clevage of the ovum or egg in the first stages of its
   development; -- called also {mulberry mass}, {segmentation
   sphere}, and {blastosphere}. See {Segmentation}.

Source : WordNet®

morula
     n : a solid mass of blastomeres that forms when the zygote
         splits; develops into the blastula
     [also: {morulae} (pl)]

morulae
     See {morula}