Many of you are here only because penicillin saved your life, or the life of one of your parents or grandparents. Penicillin's ability to cure people of many once-fatal bacterial infections has saved so many lives that it is easy to understand why it was once called a "miracle drug".
Penicillin is defined as any antibiotic drug taken from molds or made synthetically to treat different diseases and/or infections. More specifically, penicillin is the liquid which is secreted from penicillium notatum, which is the mold.
Penicillin (sometimes abbreviated PCN or pen) is a group of ß-lactam antibiotics used in the treatment of bacterial infections caused by susceptible, usually Gram-positive, organisms. "Penicillin" is also the informal name of a specific member of the penicillin group Penam Skeleton.
Proudly wear a Penicillin Molecule T-Shirt to celebrate the "wonder drug" that has has allowed your family genes, which should have been stopped long ago, to carry on.