Learn how to say Euclidean correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word Euclidean:
relating to or denoting the system of geometry based on the work of Euclid and corresponding to the geometry of ordinary experience:
of such a nature that the postulates of the Euclidean system of geometry are valid:
all points on a Euclidean circle are equidistant from the centre
Compare with non-Euclidean.