(geometry) A theorem which states that, in 3-dimensional space, any displacement of a rigid body such that some point on it remains fixed is equivalent to a single rotation about some axis that runs through said point.

Beta Delphini A, one of the two components of a binary star in the constellation of Delphinus.

The United States Capitol rotunda.

Alternative form of rotoevaporator

An unpowered rotary-wing aircraft.

plural of rotor kite

(medicine) rotationplasty

(medicine) rotationplasty

plural of rotary table

(metalworking) A device for precisely positioning the workpiece, enabling the operator to drill or cut at exact intervals around a fixed axis.