1. containing half a molecule of water per molecule of the compound; having a water content equivalent to one water molecule for every two molecules of the substance
Usage: chemistry; technical

Examples

• Calcium sulfate hemihydrated is commonly known as plaster of Paris.
• The hemihydrated form of the mineral contains exactly half a mole of water per mole of salt.
• When heated, the hemihydrated compound loses its water of crystallization.
• The hemihydrated salt has different physical properties than its fully hydrated counterpart.
• Chemists often work with hemihydrated compounds in laboratory synthesis.