Periaktoi vs. Periaktos

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Difference Between Periaktoi and Periaktos
Periaktoinoun
A device for changing scenery in a theatre. A row of adjacent, three-sided columns form a backdrop to the stage and are turned in unison to show a different face.
Periaktosnoun
(historical) A revolving structure used to change scenes rapidly in a theatre: a tall prism-shaped frame or screen at the side entrances, each carrying a number of scenes changed by turning the frames.