1) Physicist 2) Robert andrews millikan 
[crater] Millikan is a lunar impact crater in the northern hemisphere of the Moon`s far side. It is located to the north of the crater H. G. Wells, and to the southwest of von Békésy. The rim edge of Millikan is roughly circular and well-defined, but with some irregularities. There are some small outward bulges along the south and east wh...
[n] - United States physicist who isolated the electron and measured its charge (1868-1953)
Robert Andrews Millikan noun United States physicist who isolated the electron and measured its charge (1868-1953)