E

(noun) a fat-soluble vitamin that is essential for normal reproduction; an important antioxidant that neutralizes free radicals in the body. Synonyms: vitamin E, tocopherol.

(noun) a radioactive transuranic element produced by bombarding plutonium with neutrons. Synonyms: einsteinium, Es, atomic number 99.

(noun) the cardinal compass point that is at 90 degrees. Synonyms: east, due east, eastward.

(noun) the base of the natural system of logarithms; approximately equal to 2.718282.... Synonyms: e.

(noun) the 5th letter of the Roman alphabet. Synonyms: e.