phenanthridinium

noun
phe·nan·thri·din·i·um | \ fi-ˌnan(t)-thrə-ˈdin-ē-əm \

Medical Definition of phenanthridinium 

: the ion [C13H9NH]+ derived from phenanthridine and occurring in substituted form in quaternary salts used as trypanocides

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occurring twice a year or every two years

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