pregastrular

gastrula

[gas-troo-luh]
noun, plural gastrulas, gastrulae [gas-troo-lee] . Embryology.
a metazoan embryo in an early state of germ layer formation following the blastula stage, consisting of a cuplike body of two layers of cells, the ectoderm and endoderm, enclosing a central cavity, or archenteron, that opens to the outside by the blastopore: in most animals progressing to the formation of a third cell layer, the mesoderm.

Origin:
1875–80; < Neo-Latin; see gastro-, -ule

gastrular, adjective
pregastrular, adjective
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World English Dictionary
gastrula (ˈɡæstrʊlə)
 
n , pl -las, -lae
ectoderm mesoderm See also endoderm a saclike animal embryo consisting of three layers of cells (ectoderm, mesoderm, and endoderm) surrounding a central cavity (archenteron) with a small opening (blastopore) to the exterior
 
[C19: New Latin: little stomach, from Greek gastēr belly]
 
'gastrular
 
adj

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Medical Dictionary

gastrula gas·tru·la (gās'trə-lə)
n. pl. gas·tru·las or gas·tru·lae (-lē')
An embryo at the stage following the blastula, consisting of a hollow, two-layered sac of ectoderm and endoderm surrounding an archenteron that communicates with the exterior through the blastopore.

The American Heritage® Stedman's Medical Dictionary
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American Heritage
Science Dictionary
gastrula   (gās'trə-lə)  Pronunciation Key 
Plural gastrulas or gastrulae (gās'trə-lē')
An animal embryo at the stage following the blastula. The gastrula develops from the blastula by invagination (inpocketing), forming an inner cavity with an opening and causing the cells to be distributed into an outer layer (ectoderm) and an inner layer (endoderm). In complex animals such as vertebrates, a third layer (mesoderm) also forms. These layers later develop into the organs and tissues of the body. In vertebrates and other deuterostomes, the opening of the gastrula becomes the anus, while in protostomes (such as arthropods), it becomes the mouth. ◇ The development of an embryo from blastula to gastrula is called gastrulation. Compare blastula.
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