par·a-a·mi·no·sal·i·cyl·ic acid (p?r??-?-m??n?-s?l??-s?l??k, ?m??-n?-)n. Abbr. PAS A bacteriostatic agent, C7H7NO3, prescribed for the treatment of tuberculosis. Also called aminosalicylic acid.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.