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.
There are many classes of antibiotics for sinus infection. Know the latest, stronger and best antibiotics in use today for acute and chronic sinus infection treatment. Antibiotic Definition. Antibiotics are medicines used to treat infections caused by bacteria. They are anti-bacterial in nature. This means that the drugs have the capability of killing the bacteria often called bactericidal or stopping the bacteria from multiplying further called bacteriostatic.