The leader of an opera chorus or another ensemble of singers.
cryophorus
cryophorus
noun
(chemistry) 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 and containing only a quantity of water and water vapour, devoid of air. The water is in one of the bulbs, and freezes when the other is cooled below zero.
