circle vs eristic

A form of argument in which two or more unproved statements are used to prove each other; inconclusive reasoning. 

An instrument of observation, whose graduated limb consists of an entire circle. When fixed to a wall in an observatory, it is called a mural circle; when mounted with a telescope on an axis and in Y's, in the plane of the meridian, a meridian or transit circle; when involving the principle of reflection, like the sextant, a reflecting circle; and when that of repeating an angle several times continuously along the graduated limb, a repeating circle. 

A two-dimensional geometric figure, a disk, consisting of the set of all those points of a plane at a distance less than or equal to a fixed distance (radius) from a given point. 

A line comprising two semicircles of 30 yards radius centred on the wickets joined by straight lines parallel to the pitch used to enforce field restrictions in a one-day match. 

A bagginess of the skin below the eyes from lack of sleep. 

A series ending where it begins, and repeating itself. 

A territorial division or district. 

Any thin three-dimensional equivalent of the geometric figures. 

Any shape, curve or arrangement of objects that approximates to or resembles the geometric figures. 

A two-dimensional geometric figure, a line, consisting of the set of all those points in a plane that are equally distant from a given point (center). 

A curve that more or less forms part or all of a circle. 

A specific group of persons; especially one who shares a common interest. 

The orbit of an astronomical body. 

A ritual circle that is cast three times deosil and closes three times widdershins either in the air with a wand or literally with stones or other items used for worship. 

A traffic circle or roundabout. 

One who makes specious arguments; one who is disputatious. 

A type of dialogue or argument where the participants do not have any reasonable goal. The aim is to argue for the sake of conflict, and often to see who can yell the loudest.