Learn how to say Penicillin correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word penicillin:
1an antibiotic or group of antibiotics produced naturally by certain blue moulds, now usually prepared synthetically. Penicillin was discovered in 1928 and during the Second World War became the first antibiotic to be used by doctors:
patients who are allergic to penicillin
penicillins and cephalosporins
2a blue mould of a type that produces penicillin.
Genus Penicillium, subdivision Deuteromycotina
from the modern Latin genus name Penicillium (see penicillium) + -in1