A transuranic chemical element (symbol Es) with atomic number 99: a soft, silvery, paramagnetic metal.

Of or relating to the German-born theoretical physicist Albert Einstein or his scientific theories.

Not in accordance with the theories of physics as laid out by Albert Einstein. / (rare) Unlike Albert Einstein; unintelligent.

Synonym of relativity (either Albert Einstein's special relativity or general relativity)

The physics of Albert Einstein, including general relativity and concepts that go beyond classical Newtonian mechanics.

(informal) A female Einstein (extremely intelligent, clever person).

plural of Einsteinette