Definition of para-aminosalicylic in US English:

para-aminosalicylic

noun

  • "para-aminosalicylic acid", a crystalline compound, 4-amino-2-hydroxybenzoic acid, (HOOC)C₆H₃(OH)(NH₂), used as an antibiotic, especially in the treatment of tuberculosis; abbreviated PAS.

Origin

1940s; earliest use found in The Lancet.