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.
Definition of XENOBIOTIC. : a chemical compound (as a drug, pesticide, or carcinogen) that is foreign to a living organism.â xenobiotic adjective. ADVERTISEMENT. a chemical compound (as a drug, pesticide, or carcinogen) that is foreign to a living organism. â xenobiotic adjective. ADVERTISEMENT.