pl. -·lae· or -·las
an embryo in an early stage of development, consisting of a sac with two layers, the ectoderm and endoderm, enclosing a central cavity, the archenteron, that opens to the outside through the blastopore
Origin of gastrulaModL, diminutive ; from Classical Greek gast?r, the stomach
nounpl. gas·tru·las or gas·tru·lae
An embryo at the stage following the blastula, after the movement of cells results in the formation of the three germ layers, ectoderm, mesoderm, and endoderm.
Origin of gastrulaNew Latin : Greek gast&emacron;r, gastr-, belly + Latin -ula, feminine diminutive suff.