Romanian word apus comes from Latin pono (I ordain. I place, put, lay. I set up, pitch (camp).), Latin ad ((direction) toward, to, on, up to, for.), Latin ad- (To.)

Detailed word origin of apus

Dictionary entry	Language	Definition
pono	Latin (lat)	I ordain. I place, put, lay. I set up, pitch (camp).
ad	Latin (lat)	(direction) toward, to, on, up to, for.
ad-	Latin (lat)	To.
appono	Latin (lat)	I appoint, assign.. I place near, set before (on table), serve up.. I put, apply, add to.
apune	Romanian (ron)	(figuratively) to die. (of a heavenly body) to set. To fade, decline.
apus	Romanian (ron)	(of cellestial bodies) set. Bygone, dead, vanished (figurative) decline. (now, uncommon) west. Sunset.

Words with the same origin as apus