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

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