Antibiotic

As a Noun

1. A substance used to kill or inhibit the growth of bacteria and treat infections.
2. A type of medication derived from microorganisms or synthesized chemically to fight bacterial diseases.

As an Adjective

1. Relating to or involving antibiotics.
2. Having bacteria-killing properties.

Word History

The word antibiotic comes from the Greek anti- (against) and bios (life), meaning “against life” (referring to bacteria). It was first used in the early 20th century, especially after the discovery of penicillin by Alexander Fleming in 1928.

Examples

1. The doctor prescribed an antibiotic to treat the infection. (Noun)
2. Overuse of antibiotics can lead to resistance. (Noun)
3. The antibiotic properties of the drug help fight bacterial infections. (Adjective)

Synonyms

Antibacterial, antimicrobial, germ-killer, infection-fighter

Related Words

Penicillin, amoxicillin, tetracycline, antifungal

Antonyms

Virus-friendly, non-antibacterial, probiotic