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