nalidixic acid

US: (nā′li dik′sik, nā′-)

WordReference Random House Unabridged Dictionary of American English © 2025

na′li•dix′ic ac′id  (nā′li dik′sik, nā′-), [Pharm.]

1. Drugs a substance, C₁₂H₁₂N₂O₃, that has antibacterial activity against many susceptible Gram-negative organisms, esp. used in the treatment of urinary tract infections.

• by shortening and rearrangement of naphthyridine and carboxylic acid, components of its chemical name 1960–65