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n. pl. blas·tu·las or blas·tu·lae (-lē′)
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.
[New Latin : from Greek blastos, bud + Latin -ula, feminine diminutive suff.]
blas′tu·la′tion (-lā′shən) n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
n, pl -las or -lae (-liː)
(Biology) an early form of an animal embryo that develops from a morula, consisting of a sphere of cells with a central cavity. Also called: blastosphere
[C19: New Latin; see blasto-]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
blas•tu•la(ˈblæs tʃə lə)
n., pl. -las, -lae (-ˌli)
the early developmental stage of an animal, following the morula stage and consisting of a single spherical layer of cells enclosing a hollow, central cavity. Compare blastocyst.
[1885–90; < Greek blast(ós) bud, sprout + New Latin -ula -ule]
blas`tu•la′tion (-ˈleɪ ʃən) n.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
Plural blastulas or blastulae (blăs′chə-lē′)
An embryo at the stage immediately following the division of the fertilized egg cell, consisting of a ball-shaped layer of cells around a fluid-filled cavity. Compare gastrula.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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|Noun||1.||blastula - 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|
conceptus, fertilized egg, embryo - an animal organism in the early stages of growth and differentiation that in higher forms merge into fetal stages but in lower forms terminate in commencement of larval life
blastocele, blastocoel, blastocoele, cleavage cavity, segmentation cavity - the fluid-filled cavity inside a blastula
blastocyst, blastodermic vessicle - the blastula of a placental mammal in which some differentiation of cells has occurred
trophoblast - the membrane that forms the wall of the blastocyst in early development; aids implantation in the uterine wall; "after implantation of the blastocyst in the uterine wall the trophoblast divides into two layers, the chorion and the placenta"
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
n. blástula, etapa primitiva del óvulo.
English-Spanish Medical Dictionary © Farlex 2012