silˈdenəˌfil noun
( -s )
Etymology: perhaps by alteration and recombination of letters from sulfonyl , phenyl , and pyrimidine
: a drug that is used in the form of its citrate C 22 H 30 N 6 O 4 S to treat erectile dysfunction in males, that by suppressing a phosphodiesterase enzyme also suppresses the enzyme's inhibitory effect on the hormone cyclic GMP, and that enables the cyclic GMP produced during sexual arousal to initiate the muscular and vascular changes which produce an erection