vidarabine

noun
vid·ar·a·bine | \ vid-ˈär-ə-ˌbēn \

Medical Definition of vidarabine 

: an antiviral agent C10H13N5O4·H2O derived from adenine and arabinoside and used especially to treat keratitis and encephalitis caused by the herpes simplex virus

called also adenine arabinoside, ara-A

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occurring twice a year or every two years

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