noun, plural blas·tu·las, blas·tu·lae . [ blas-ch uh-lee] /ˈblæs tʃəˌli/ . Embryology 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. Origin of blastula 1885–90;
) bud, sprout +
New Latin -ula -ule Related forms blas·tu·lar, adjective blas·tu·la·tion , [blas-ch uh- ley-sh uh n] /ˌblæs tʃəˈleɪ ʃən/ noun
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for blastula Historical Examples of blastula
The round cluster becomes filled with fluid, and we have a hollow sphere of cells, which I call the
The hollow sphere which is thus formed is the important stage of the “germinal vesicle,” the
blastula, or blastosphere.
Consider its mode of division, and the formation of the
blastula, gastrula, and germinal layers.
blastula showing complete segmentation the blastomeres of the upper hemisphere are the more finely subdivided.
Our next question concerns the distribution of potentiality, when the embryo is developed further than the
blastula stage. British Dictionary definitions for blastula noun plural -las or -lae ( -liː) 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 Derived Forms blastular, adjective Word Origin for blastula
C19: New Latin; see
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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Word Origin and History for blastula n.
embryonic state, 1875, Modern Latin, from Greek
blastos "sprout, germ" + diminutive ending -ula.
Online Etymology Dictionary, © 2010 Douglas Harper
n. pl. blas•tu•las An early embryonic form produced by cleavage of a fertilized ovum and consisting of a spherical layer of cells surrounding a fluid-filled cavity. Related forms blas ′tu•lar adj. blas′tu•la ( ′tion -lā) ′shən n.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Plural blastulas blastulae ( blăs) ′chə-lē′ An animal 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 known as a blastocoel. Compare gastrula. See also blastocyst.
The American Heritage® Science Dictionary
Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
blastula [( blas-chuh-luh)]
The New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.