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- n a fat-soluble vitamin that is essential for normal reproduction; an important antioxidant that neutralizes free radicals in the body
- n a radioactive transuranic element produced by bombarding plutonium with neutrons
- n the cardinal compass point that is at 90 degrees
- n the base of the natural system of logarithms; approximately equal to 2.718282...
- n the 5th letter of the Roman alphabet