'anti-blennorrhagic' originates in Modern English as a compound formed from the prefix 'anti-' (meaning 'against') and 'blennorrhagic', itself derived from medical formation.

'blennorrhagic' comes from New Latin/medical Greek formation from Greek 'blennorrhagia' (βλεννορραγία), where 'blenno-' (βλέννη) meant 'mucus' and '-rrhagia' (ῥοιά/ῥαγία) meant 'excessive flow' or 'discharge'; this passed into Late Latin/medical Latin and then into English as a technical term, and 'anti-' was prefixed in Modern English to indicate opposition.

Initially the root referred broadly to 'mucus flow' or 'mucous discharge' in Greek medical usage; over time the composite medical terms came to denote specifically pathological excessive mucous discharge and agents acting against it, giving the modern meaning of 'preventing or treating mucous discharge.'