erectile dysfunction

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The inability to achieve penile erection or to maintain an erection until ejaculation.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun pathology The inability of a man to obtain or sustain an erection. Abbreviation: ED

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun impotence resulting from a man's inability to have or maintain an erection of his penis