amniotic cavity(n = noun.body) - the fluid-filled cavity that surrounds the developing embryo;
is a kind of bodily cavity, cavity, cavum
has parts: amnionic fluid, amniotic fluid, waters

abdominal cavity, amniotic, amniotic fluid, amniotic sac, axillary cavity, bodily cavity, buccal cavity, cavity, cavity resonator, cavity wall, chest cavity, cleavage cavity, cotyloid cavity, cranial cavity, glenoid cavity, intracranial cavity, lesser peritoneal cavity, nasal cavity, oral cavity, orbital cavity, pelvic cavity, pericardial cavity, peritoneal cavity, pleural cavity, pulp cavity, segmentation cavity, thoracic cavity, tubular cavity, tympanic cavity, uterine cavity