Plainly
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penicillin
nounPEN-ih-SILL-in
meaning in plain English
A medicine made from mold that kills certain germs and helps cure infections like strep throat or pneumonia.
Picture a moldy pen writing 'cillin'—penicillin, the mold-made medicine that zaps germs like a superhero pen.
for example
After the doctor tested her blood, she was relieved to learn her infection would respond well to penicillin.