Why he had taken refuge in the chapel, he didn't know. His mind had been non-op for a long time now and he just let the impulses flow.1980, Mike McQuay, Lifekeeper, Bantam Books, published 1985, →ISBN, page 254:
2
Medicine, SciencesInformal Nonoperative; not using or requiring surgical treatment.
Richt says the surgery should help speed Samuel's recovery. "It was debatable on whether it could have been non-op or not, but this will absolutely stabilize it immediately and allow him to get stronger quicker," Richt said.2011 November 1, Charles Odum, “Georgia suspends Crowell, 2 other backs for 1 game”, in The New York Times:
3
Informal Having chosen not to undergo sex reassignment surgery.
Of a transgender or transsexual person
"Just so you know, Vincent, I was a pre-op transsexual. But after my breasts grew and my hips got wider, I was happy with what I had and decided to go non-op."2010, Steven A. Buckhalter, Murder in Protective Custody: Transgenders in Peril Behind Bars, Xlibris Corporation, →ISBN, page 145:
4
Informal Nonoperating; not directly involved in the mechanical operation of trains.
About 200000 "non-op" workers - clerks, telegraphers, machinists, and others not actually involved in operation of the roads - are not union members.1951 December 12, “Nonoperating Rail Unions Ask Wage-Contract Support”, in Christian Science Monitor:
non-op
noun
Etymology From non- + op (“an operation; an operator; operational; operative; operating”).
1
Informal A transsexual or transgender person who has chosen not to undergo sex reassignment surgery.
It is interesting that Galatea makes reference to some encouragement from "post-op" transsexuals, though other "non-ops" advise surgical candidates to reconsider their decision.1998, Claudine Griggs, S/He: Changing Sex and Changing Clothes, Berg, published 2003, →ISBN, pages 84–85:
For example, in the fall of 1973, when we had a rail strike, the government brought in legislation putting the non-ops back to work at an increase of only 30 cents an hour […]1980, Jack Horner, My Own Brand, Hurtig Publishers, →ISBN: