• (n.) An instrument to indicate the state of the atmosphere, especially changes of atmospheric pressure, and hence changes of weather, as a barometer or baroscope. Found on http://thinkexist.com/dictionary/meaning/weatherglass/
Weath'er·glass` noun An instrument to indicate the state of the atmosphere, especially changes of atmospheric pressure, and hence changes of weather, as a barometer or baroscope. Poor man's weatherglass . (Botany) See under Poor . Found on http://www.encyclo.co.uk/webster/W/20