EUCLID

Geometrician of the 3rd century BC (6)

Solution has appeared in 2 crosswords (1 across and 1 down):

• Quick crossword No 15,431 — 2019-10-21 23:00:42
  16D: Greek mathematician, d. mid-3rd century BC (6)
• Quick crossword No 15,189 — 2019-01-12 00:00:24
  13A: Geometrician of the 3rd century BC (6)