gravis

adjective
gra·vis | \ ˈgra-vəs , ˈgrä- , ˈgrā- \

Medical Definition of gravis 

: tending to be more virulent than average used especially of strains of diphtheria bacilli — see icterus gravis, icterus gravis neonatorum, myasthenia gravis — compare intermedius, mitis

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