e- /(ˈ)i, ɪ/
  e- 前綴
  E-. A Latin prefix meaning out, out of, from; also, without. See Ex-.
  ◄ ►
  E
       n 1: a fat-soluble vitamin that is essential for normal
            reproduction; an important antioxidant that neutralizes
            free radicals in the body [syn: vitamin E, tocopherol]
       2: a radioactive transuranic element produced by bombarding
          plutonium with neutrons [syn: einsteinium, Es, atomic
          number 99]
       3: the cardinal compass point that is at 90 degrees [syn: east,
           due east]
       4: the base of the natural system of logarithms [syn: 2.718282...]
       5: the 5th letter of the Roman alphabet