DES (dē'ē-ěs')
n.
Diethylstilbestrol; a synthetic nonsteroidal substance having estrogenic properties and once used to treat menstrual disorders. It is no longer used due to the incidence of certain vaginal cancers in the daughters of women so treated.
nonsteroidal synthethic estrogen used as a drug and formerly used to promote growth of livestock. Unlike natural estrogens, DES remains active following oral administration. It is also administered as vaginal suppositories and by injection. DES breaks down more slowly in the body than do the natural estrogens.