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vol·vox | \ ˈväl-ˌväks 
, ˈvȯl- \
, ˈvȯl- \Definition of volvox
: any of a genus (Volvox) of flagellated unicellular green algae that form spherical colonies
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Time Traveler for volvox
The first known use of volvox was in 1798
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