chemical element, element - any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter

fool's gold, iron pyrite, pyrite - a common mineral (iron disulfide) that has a pale yellow color

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

compass point, point - any of 32 horizontal directions indicated on the card of a compass; "he checked the point on his compass"