a small thermonuclear device in the warhead of a missile

(obsolete, chemistry) phosphine

Any vehicle that uses hydrogen as its principal fuel, normally via the electricity produced by a fuel cell.

(physics) all the lines in the emission or absorption spectrum of hydrogen; each one corresponding to an allowed transition between quantum energy levels

A service station for hydrogen vehicles.

(obsolete, inorganic chemistry) The compound arsine.

(obsolete, chemistry) Stibine.

(obsolete, chemistry) methane

(chemistry) the process of forming a hydrogen bond

(chemistry) Any acid that contains at least one atom of hydrogen. / (industrial) hydrofluoric acid.