3rd century bc, Greek mathematician of Alexandria; author of Elements, which sets out the principles of geometry and remained a text until the 19th century at least
2.
the works of Euclid, esp his system of geometry
Derived forms
Euclidean or Euclidian (juːˈklɪdɪən)
adjective
Euclid in American English1
(ˈjuklɪd)
fl. 300 b.c.; Gr. mathematician: author of a basic work in geometry