'Al-Hasan ibn al-Haytham' definitions:

An Egyptian polymath (born in Iraq) whose research in geometry and optics was influential into the 17th century; established experiments as the norm of proof in physics (died in 1040) [syn: Alhazen, Alhacen, al-Haytham, Ibn al-Haytham, Al-Hasan ibn al-Haytham]