GASTRÆA
\ɡˈastɹɑː], \ɡˈastɹɑː], \ɡ_ˈa_s_t_ɹ_ɑː]\
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gas-tr[=e]'a, n. (biol.) a hypothetic animal form assumed by Hæckel as the ancestor of all metazoic animals:--pl. GASTRÆ'Æ.--n. GAS'TRULA, that embryonic form of metazoic animals which consists of a two-layered sac enclosing a central cavity and having an opening at one end:--pl. GRAS'TRULÆ.--adj. GAS'TRULAR.
By Thomas Davidson
