Index of English words, starting with "he"

(1) - Heptahedron (n.) A solid figure with seven sides.

(1) - Heptamerous (a.) Consisting of seven parts, or having the parts in sets of sevens.

(1) - Heptane (n.) Any one of several isometric hydrocarbons, C7H16, of the paraffin series (nine are possible, four are known); -- so called because the molecule has seven carbon atoms. Specifically, a colorless liquid, found as a constituent of petroleum, in the tar oil of cannel coal, etc.