e

Noun

• the 5th letter of the Roman alphabet

• the base of the natural system of logarithms; approximately equal to 2.718282...

• the cardinal compass point that is at 90 degrees

• a radioactive transuranic element produced by bombarding plutonium with neutrons

• a fat-soluble vitamin that is essential for normal reproduction; an important antioxidant that neutralizes free radicals in the body

Related words

• Synonyms: 
  E , east , due east , eastward , einsteinium , Es , atomic number 99 , vitamin E , tocopherol