Definition of neoarsphenamine in US English:

neoarsphenamine

noun

Pharmacology
  • The sodium salt of a sulphated arsphenamine derivative, C₁₃H₁₃As₂N₂NaO₄S, a toxic yellow compound used to treat bacterial infections (formerly especially syphilis, now only in veterinary medicine).

Origin

Early 20th century; earliest use found in Public Health Report. From neo- + arsphenamine.