alpha-tocopheral - a potent form of vitamin E obtained from germ oils or by synthesis

antioxidant - substance that inhibits oxidation or inhibits reactions promoted by oxygen or peroxides

fat-soluble vitamin - any vitamin that is soluble in fats

metal, metallic element - any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.

cardinal compass point - one of the four main compass points

irrational number - a real number that cannot be expressed as a rational number

Latin alphabet, Roman alphabet - the alphabet evolved by the ancient Romans which serves for writing most of the languages of western Europe

alphabetic character, letter of the alphabet, letter - the conventional characters of the alphabet used to represent speech; "his grandmother taught him his letters"