Alternative form of rotten egg gas

(colloquial) hydrogen sulfide

(zoology) Any foraminiferan of the order Rotaliida

plural of rotaliid

(mineralogy) A soft stone used in artistic grinding and polishing, and for cleaning metallic substances. The name is also given to other friable siliceous stones applied to similar uses.

A small round building, completely open at the sides and without walls, where a band of musicians can play to an audience. Usually situated in a public park.

(mathematics) A method of finding a solution to a mathematical problem in Minkowski space from a solution to a related problem in Euclidean space by means of a transformation that substitutes an imaginary-number variable for a real-number variable.

(typography) A curved form of the letter r, found in some medieval and fraktur scripts: ⟨ ꝛ ⟩.

(zoology) Belonging or relating to the Rotaliina.

plural of rotten apple