-və(r) noun
( -s )
Etymology: revolve (I) + -er
1. : a handgun having a cylinder of several chambers that are brought successively into line with the barrel and discharged with the same hammer — compare pistol
2. : the particular indeterminate form assumed by the three-point problem in surveying or navigating when the point of observation falls on a circle through the three fixed points
3. : one that revolves ; especially : a revolving device