segmentation cavity(n = noun.animal) blastocele, blastocoel, blastocoele, cleavage cavity - the fluid-filled cavity inside a blastula;
is a kind of bodily cavity, cavity, cavum
is a part of blastosphere, blastula

abdominal cavity, amniotic cavity, 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, thoracic cavity, tubular cavity, tympanic cavity, uterine cavity