cavity
noun
[ ˈkavɪti ]
• an empty space within a solid object.
• "the abdominal cavity"
Similar:
space,
chamber,
hollow,
hole,
pocket,
pouch,
orifice,
aperture,
socket,
gap,
crater,
pit,
cutting,
concavity,
lacuna,
sac,
alveolus,
ampulla,
antrum,
archenteron,
bulla,
bursa,
lumen,
orbit,
sinus,
ventricle,
vesicle,
calyx,
cyst,
geode,
vug,
Origin:
mid 16th century: from French cavité or late Latin cavitas, from Latin cavus ‘hollow’.