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penicillin (n.)

antibiotic agent active against bacteria but harmless to most persons, 1929, coined in English by Alexander Fleming (1881-1955), who first recognized its antibiotic properties, from Modern Latin Penicillium notatum (1867), the name of the mould from which it was first obtained, from Latin penicillus "paintbrush" (see pencil (n.)), in reference to the shape of the mould cells.

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Definitions of penicillin from WordNet

penicillin (n.)
any of various antibiotics obtained from Penicillium molds (or produced synthetically) and used in the treatment of various infections and diseases;
From wordnet.princeton.edu