vibrio Syllabification: (vib·ri·o)Pronunciation: /ˈvibrēˌō/Definition of vibrio noun (plural vibrios) Medicine a waterborne bacterium of a group that includes some pathogenic kinds that cause cholera, gastroenteritis, and septicemia. Vibrio and related genera; motile Gram-negative bacteria occurring as curved flagellated rods Origin:modern Latin, from Latin vibrare 'vibrate'vibrio in other Oxford dictionaries Definition of vibrio in the British & World English dictionary