from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. 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.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. An early form in the development of an embryo, consisting of a spherical layer of cells filled with fluid; a blastosphere.

from the GNU version of the Collaborative International Dictionary of English

  • n. That stage in the development of the ovum in which the outer cells of the morula become more defined and form the blastoderm.

from The Century Dictionary and Cyclopedia

  • n. In embryology: An embryo of one of the Metazoa, in the stage in which it consists of a sac formed of a single layer of cells.
  • n. In Haeckel′ s vocabulary of embryology, same as blastosphere, .

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. early stage of an embryo produced by cleavage of an ovum; a liquid-filled sphere whose wall is composed of a single layer of cells; during this stage (about eight days after fertilization) implantation in the wall of the uterus occurs


New Latin : from Greek blastos, bud + Latin -ula, feminine diminutive suffix.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From New Latin, diminutive of Ancient Greek βλαστός (blastos, "a germ, bud, sprout, shoot"), from βλαστάνειν (blastanein, "to bud, sprout, grow, properly of plants, but also of animals"). (Wiktionary)


  • 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.

    Think Progress » Michael J. Fox: ‘I Could Give a Damn About Rush Limbaugh’s Pity…I’m Not A Victim’

  • 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.

    The Evolution of Man — Volume 1

  • The development of most animals is characterized by distinctive stages, including a zygote, formed by the product of the first few division of cells following fertilization; a blastula, which is a hollow ball of cells formed by the developing zygote; and a gastrula, which is formed when the blastula folds in on itself to form a double-walled structure with an opening to the outside, the

    Conservapedia - Recent changes [en]

  • After the egg is fertilized it becomes a blastula, which is free swimming.

    CreationWiki - Recent changes [en]

  • If we say that a blastula is a human being, I can't even imagine the scale of the tragedy we've engendered just by attempting to bring new life into the world.

    Charlottesville Blogs

  • The visceral embryonic vesicle (blastocystis or gastrocystis) of a rabbit (the "blastula" or vesicula blastodermica of other writers), a outer envelope (ovolemma), b skin-layer or ectoderm, forming the entire wall of the yelk-vesicle, c groups of dark cells, representing the visceral layer or entoderm.

    The Evolution of Man — Volume 1

  • The characteristic embryonic form that the developing mammal now exhibits has up to the present usually been called the "blastula"

    The Evolution of Man — Volume 1

  • What is called the "blastula" of the mammal and the real blastula of the amphioxus and many of the invertebrates are totally different embryonic structures.

    The Evolution of Man — Volume 1

  • You will never sell most people on the concept zygote = blastula = embryo = fetus = baby, which is what is required of them to even “get” your “intrinsic connection.”

    House Judiciary Panel Hearings on ‘Imperial Presidency’ « Blog


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  • "When you’re twisting balloons for children, never tell them what you’re making. The majority of the finished products—despite your best attempts—almost always look like a dog, a blastula, or something vaguely phallic. If you identify what you’re actually attempting to make, the children will respond to your finished product with, 'That doesn’t look like a insert animal name…' But if you make the animals and then ask, 'What does it look like to you?' the child’s imagination will take over, turning the blue, four-legged balloon into Blue from Blue’s Clues, the blastula into a Pokemon, and the phallic object into an elephant. You’ll also get bonus points because you were so cool for making exactly what they wanted."
    - 'Tricks Of The Trade', Matthew Baldwin, 22 Dec 2007.

    December 23, 2007

  • "Empty of everything, in a hum of sempiternal readiness for that soul-wilting, muse-recoiling Jawohl, Herr Kommandant! to shoot up one’s spinal column as quick as a blastula ..." from John Latta's Isola di Rifiuti

    August 3, 2007