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Definition of "blastula" [blas•tu•la]

  • An early embryonic form produced by cleavage of a fertilized ovum and consisting of a spherical layer of cells surrounding a fluid-filled cavity. Also called blastosphere. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Use "blastula" in a sentence
  • "It’s not a solid ball but a hollow one, and it is called the blastula."
  • "The only people politicizing the use of embryonic stem cells are those who claim that a blastula, which is an invisible to the naked eye group of cells an embryo is not the same thing as a fetus, is a human."
  • "The globular wall of the blastula is a real blastoderm, and consists of homogeneous (blastodermic) cells; it is not yet differentiated into the two primary germinal layers."
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