(chemistry) acetic acid

(physics, of an atom or molecule) Having a single electron.

(chemistry, transitive) to treat something, or react something, with hydrogen; especially to react an unsaturated fat with hydrogen, in the presence of a nickel catalyst, to produce a harder saturated fat

(chemistry) the tellurium analogue of hydrogen sulfide, H₂Te

(biology) the transmission of hydrogen from water to carbohydrates etc and back to water by living organisms

(inorganic chemistry) A toxic gas, H₂S, smelling like rotten eggs and used in analytical chemistry and industry.

(obsolete, chemistry) hydrogen

To skim the surface of a body of water while moving at high speed.

(nautical) A specific type of motorboat used exclusively for racing. / (aircraft, nautical) A seaplane; any aircraft capable of taking off from, and alighting on the surface of water.

(physics, astronomy) the nucleosynthesis process, in stars of less than 1.2 solar mass, in which hydrogen is converted to helium, deuterium and some lithium