Euclase :: Euclase (n.) A brittle gem occurring in light green, transparent crystals, affording a brilliant clinodiagonal cleavage. It is a silicate of alumina and glucina..
Euclid :: Euclid (n.) A Greek geometer of the 3d century b. c.; also, his treatise on geometry, and hence, the principles of geometry, in general..
Euclidian :: Euclidian (n.) Related to Euclid, or to the geometry of Euclid..