Cry*oph"o*rus (krī*ŏf"?*rŭs),
n. [NL., fr. Gr. kry`os icy cold,
frost + fe`rein to bear.] (Chem.) An
instrument used to illustrate the freezing of water by its own
evaporation. The ordinary form consists of two glass bulbs,
connected by a tube of the same material, and containing only a
quantity of water and its vapor, devoid of air. The water is in
one of the bulbs, and freezes when the other is cooled below
32° Fahr.