Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

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

from The Century Dictionary.

  • noun 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.
  • noun In Haeckel′ s vocabulary of embryology, same as blastosphere, .

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Biol.) That stage in the development of the ovum in which the outer cells of the morula become more defined and form the blastoderm.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

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

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

  • noun 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

Etymologies

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

[New Latin : from Greek blastos, bud + Latin -ula, feminine diminutive suff.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

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").

Examples

  • It’s not a solid ball but a hollow one, and it is called the blastula.

    THE GREATEST SHOW ON EARTH

  • It’s not a solid ball but a hollow one, and it is called the blastula.

    THE GREATEST SHOW ON EARTH

  • 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

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

    CreationWiki - Recent changes [en]

  • 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]

  • 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]

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

    CreationWiki - Recent changes [en]

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

    CreationWiki - Recent changes [en]

Comments

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  • "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

  • "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