penicillin Definition

an antibiotic drug obtained from penicillium molds, used to treat infections caused by bacteria.

Using penicillin: Examples

Take a moment to familiarize yourself with how "penicillin" can be used in various situations through the following examples!

  • Example

    The doctor prescribed penicillin for my strep throat.

  • Example

    Penicillin is one of the most commonly used antibiotics.

  • Example

    The discovery of penicillin revolutionized medicine.

penicillin Synonyms and Antonyms

Synonyms for penicillin

Phrases with penicillin

  • penicillin-resistant

    refers to bacteria that are not affected by penicillin or other antibiotics


    The patient's infection was caused by penicillin-resistant bacteria.

  • an adverse reaction to penicillin or related antibiotics


    The patient had a penicillin allergy and could not take the medication.

  • an injection of penicillin given to treat an infection


    The doctor gave me a penicillin shot to help clear up my sinus infection.

Origins of penicillin

from the genus name Penicillium


Summary: penicillin in Brief

The term 'penicillin' [pen-uh-sil-in] refers to an antibiotic drug derived from penicillium molds, used to treat bacterial infections. It is commonly prescribed by doctors and has revolutionized medicine. Phrases like 'penicillin-resistant' and 'penicillin allergy' describe conditions where the drug is ineffective or causes adverse reactions.