E

noun

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

   Synonyms

   • vitamin E, tocopherol, E

   Less specific

   • fat-soluble vitamin, antioxidant

   More specific

   • alpha-tocopheral

2. a radioactive transuranic element produced by bombarding plutonium with neutrons

   Synonyms

   • einsteinium, Es, E, atomic number 99

   Less specific

   • metallic element, metal

3. the cardinal compass point that is at 90 degrees

   Synonyms

   • east, due east, eastward, E

   Less specific

   • cardinal compass point

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

   Less specific

   • transcendental number

5. the 5th letter of the Roman alphabet

   Synonyms

   • E

   Less specific

   • letter, letter of the alphabet, alphabetic character

   Member of

   • Roman alphabet, Latin alphabet