| hydro | 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 |
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| hydro | a colloidal gel in which water is the dispersion medium |
| hydro | a nonmetallic univalent element that is normally a colorless and odorless highly flammable diatomic gas |
| hydro | an atom of hydrogen |
| hydro | a colorless explosive liquid that is volatile and poisonous and foul-smelling |
| hydro | a nuclear weapon that releases atomic energy by union of light (hydrogen) nuclei at high temperatures to form helium |
| hydro | 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 |
| hydro | a colorless gas that yields hydrobromic acid in solution with water |
| hydro | a salt of carbonic acid in which one hydrogen atom has been replaced |
| hydro | a colorless corrosive gas: HCl |
| hydro | a weak poisonous acid (HCN) used in fumigating and in synthesis of organic compounds |
| hydro | a colorless poisonous corrosive liquid made by the action of sulphuric acid on calcium fluoride |