nonreturn
adjEtymology From non- + return.
1
Allowing air or liquid to travel in one direction only, and not permitting its return. (of a valve)
nonreturn
nounEtymology From non- + return.
1
Absence of return; failure to come back or bring back.
Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.