Definition of rapamycin in US English:

rapamycin

noun

Pharmacology
  • A macrolide with antifungal activity produced by the bacterium Streptomyces hygroscopicus, now used chiefly as an immunosuppressant drug.

Origin

1970s; earliest use found in Journal Antibiotics (Tokyo). From rapa (in Rapa Nui, local name of Easter Island, where the streptomycete was obtained) + -mycin.

Pronunciation

rapamycin

/ˌrapəˈmʌɪsɪn/