n a device consisting of a flat or curved piece (as a metal plate) so that its surface reacts to the water it is passing through
the fins of a fish act as hydrofoils
n a speedboat that is equipped with winglike structures that lift it so that it skims the water at high speeds
n a nonmetallic univalent element that is normally a colorless and odorless highly flammable diatomic gas; the simplest and lightest and most abundant element in the universe
n a chemical bond consisting of a hydrogen atom between two electronegative atoms (e.g., oxygen or nitrogen) with one side be a covalent bond and the other being an ionic bond