Definition of "weatherglass" [weath•er•glass]

• An instrument, such as a barometer, designed to indicate changes in atmospheric conditions. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "The still air was being stirred now by a strangely warm wind and every look at the weatherglass confirmed that the mercury shrank inside its four-foot tube."
• "Madame Fosco was alone in the hall looking at the weatherglass."
• "If a bed-ridden meteorologist is told that it rains, he may or he may not receive the fact from the force of testimony; but he will certainly be more prëdisposed to receive it, if he finds that his weatherglass is falling rather than rising."