The Collaborative International Dictionary
Still watcher
Still \Still\, n. [Cf. OE. stillatorie. See Still, v., to distill.]
A vessel, boiler, or copper used in the distillation of liquids; specifically, one used for the distillation of alcoholic liquors; a retort. The name is sometimes applied to the whole apparatus used in in vaporization and condensation.
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A house where liquors are distilled; a distillery.
Still watcher, a device for indicating the progress of distillation by the density of the liquid given over.
--Knight.