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heartfelt; sincere; wholehearted

oral cavity; mouth

lumen

body cavity; coelom

Japanese variety of music box (invented in 1892 by Toda Kindo)

gun rifling

lumen

coelenteron

medullary cavity

cloaca

cleavage cavity; segmentation cavity

pulp cavity

pleural cavity

blastocoel; blastocoele

articular cavity; cavum articulare

pericardial cavity; pericardial space; cavitas pericardiaca

amniotic cavity

medullary cavity

Perisinusoidal space