Definition of illegal. : not according to or authorized by law : unlawful, illicit; also : not sanctioned by official rules (as of a game)
antibiotic. n. 1. (Pharmacology) any of various chemical substances, such as penicillin, streptomycin, chloramphenicol, and tetracycline, produced by various microorganisms, esp fungi, or made synthetically and capable of destroying or inhibiting the growth of microorganisms, esp bacteria. adj.
Antibiotic Resistance: A Global Threat. Antibiotic resistance is the ability of bacteria to withstand the antimicrobial power of antibiotics. Simply put, antibiotics that used to cure an infection do not always work anymore. Antibiotic resistance is a global issue, and The US Centerâs for Disease Control and Prevention (CDC) considers antibiotic resistance one of their top concerns.