On the other hand, those same readers would understand that the phrase " unnecessary organs" would refer to useless bodily structures that evolution has bequeathed us. While youre on the right track, thats not quite it. That said, you may have read this headline and immediately jumped to the conclusion that the answer is the spleen. Human bodies theyre sometimes mysterious but always adaptable. So many that sometimes the docs couldn't use them all. Some folks are even born with unexpected bonus organs that dont really hurt us. I think most readers fluent in English would understand that the phrase " unneeded organs" in a news article would refer to transplant doctors' fervent hope that one day enough people would volunteer to be organ donors after their deaths that there would be a surplus of such organs available for transplant. But that's still over 5M hits for the latter, hardly a usage that most people would regard as "non-standard." (By which I term I take it you mean a word so close to obsolescence that native speakers would almost never use it and find it distractingly quaint when they heard others do so.) Today, more and more people believe unnecessary surgery and other medical. Pelvic inflammatory disease (PID), An infection in the womb, fallopian tubes and/or. You're right that "unnecessary" is used more than "unneeded": the google reports a 20:1 advantage for the former. Some intersex people have genitals or internal sex organs that fall outside. Layers of muscle which support the bladder and other organs in the pelvis.