volvoxPronunciation: /ˈvɒlvɒks/Definition of volvox noun Biology a green single-celled aquatic organism which forms minute free-swimming spherical colonies. Genus Volvox, division Chlorophyta (or phylum Chlorophyta, kingdom Protista) Origin:modern Latin, from Latin volvere 'to roll'volvox in other Oxford dictionaries Definition of volvox in the US English dictionary