Two Greek words — "one" and "stone" — produced a concept so powerful that Kubrick used it to represent alien intelligence in 2001.
A large single block of stone, especially one shaped into a pillar or monument, or any large, imposing, uniform structure or organization.
From Greek monolithos meaning made of one stone, from monos meaning single and lithos meaning stone Key roots: monos (Greek: "single, alone"), lithos (Greek: "stone").