1) Philosopher 2) The Laughing Philosopher 
[crater] Democritus is a lunar impact crater that is located on the northern part of the Moon, just to the north of the Mare Frigoris. Just to the south of Democritus is the lava-flooded crater Gärtner, which forms a bay on the mare. Directly to the north is Arnold, another flooded formation. The rim of Democritus is generally sharp-edged ...
Greek philosopher, a central figure in the development of the atomic theory of the universe.[19 related articles]
(c. 460-c. 370 BC) Greek philosopher and speculative scientist who made a significant contribution to metaphysics with his atomic theory of the universe: all things originate from a vortex of tiny, indivisible...
[n] - Greek philosopher who developed an atomistic theory of matter (460-370 BC)
noun Greek philosopher who developed an atomistic theory of matter (460-370 BC)
Greek philosopher and speculative scientist who made a significant contribution to metaphysics with his atomic theory of the universe: all things originate from a vortex of tiny, indivisible particles, which he called atoms, and differ according to the shape and arrangement of their atoms. Democritus' discussion of the constant motion of at...
(“the Laughing Philosopher”) c460–370 b.c., Greek philosopher.