D defs.my
Entry 1 sense Webster, 1913

Euclid

/yo͞ok'-lĭd/ · Eu·clid · IPA /ˈjuklɪd/
01 n. A Greek geometer of the 3d century b. c.; also, his treatise on geometry, and hence, the principles of geometry, in general.
  1. 1.
    A Greek geometer of the 3d century b. c.; also, his treatise on geometry, and hence, the principles of geometry, in general.