Your request was penicilln which is probably a typo from penicillin.
penicilln -
Traditional English :: penicillin
penicilln - n. any of various antibiotics produced naturally by moulds of the genus Penicillium, or synthetically, and able to prevent the growth of certain disease-causing bacteria. [mod.L Penicillium genus name f. L penicillum: see PENCIL]