| euclid | A Greek geometer of the 3d century; also, his treatise on geometry, and hence, the principles of geometry, in general. Source: Websters Dictionary (01 Mar 1998) |
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| euclidian | Related to Euclid, or to the geometry of Euclid. <geometry> Euclidian space, the kind of space to which the axioms and definitions of Euclid, relative to straight lines and parallel lines, apply; called also flat space, and homaloidal space. Source: Websters Dictionary (01 Mar 1998) |