e.

名词 e.:

1. a fat-soluble vitamin that is essential for normal reproduction; an important antioxidant that neutralizes free radicals in the body
   同义词：vitamin E, tocopherol, E
2. a radioactive transuranic element produced by bombarding plutonium with neutrons
   同义词：einsteinium, E, atomic number 99
3. the cardinal compass point that is at 90 degrees
   同义词：east, due east, eastward, E
4. the base of the natural system of logarithms; approximately equal to 2.718282...
   同义词：e
5. the 5th letter of the Roman alphabet
   同义词：E, letter e