Definition of isotretinoin in US English:

isotretinoin

noun

Pharmacology
  • A synthetic isomer of tretinoin used in topical and oral forms in the treatment of severe acne. [Isotretinoin is 13-cis-retinoic acid. It is a known teratogen. A trademark for this drug is Ro-accutane.]

Origin

1970s; earliest use found in Journal of the American Medical Association. From iso- + tretinoin.

Pronunciation

isotretinoin

/ˌʌɪsə(ʊ)trəˈtɪnəʊɪn/