al·pros·ta·dil 
(
ăl-pr
ŏs
t
ə-d
ĭl)
n. A prostaglandin drug, C20H34O5, that acts as a vasodilator and is used in suppository or injectable form to treat erectile dysfunction.
[Probably al(pha-cyclodextrin), sugar to which the prostaglandin is bound to increase its solubility as a drug + PROSTA(GLANDIN) + (VASO)DIL(ATOR).]