(DOK-sil) 
A form of the anticancer drug doxorubicin that is contained inside very tiny, fat-like particles and is used alone or with other drugs to treat certain types of ovarian cancer, AIDS-related Kaposi sarcoma, and multiple myeloma. Doxil may have fewer side effects and work better than other forms of doxorubicin hydrochloride. It is also being studied in the treatment of other types of cancer. Doxil is a type of anthracycline antibiotic and a type of topoisomerase inhibitor. Also called doxorubicin hydrochloride liposome and liposomal doxorubicin hydrochloride.