The assessment of the point of freezing of a liquid by using a cryoscope; algoscopy: A cryoscopy is the determination of the freezing point of a fluid, usually blood or urine, compared with that of distilled water.

A cryoscopy can also be explained as the examination of liquids, based on the principle that the freezing point of solutions varies according to the amount and the nature of the substance contained in them in solution.