A tall narrow mirror, usually set between two windows, above a pier table(noun)
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Use "pierglass" in a sentence
"Dr. van Roos made quick observations at the midpoint of her Wednesday afternoon Stockholm group: the miller's daughter played with hem of her Chanel jacket, Hansel stared at his fingers, Rapunzel checked her headscarf in the pierglass while her thumbs worried a dark stone, probably that same filthy trichobezoar."
"It would serve to buy that pair of gilt cornices or the heavy gilt-framed pierglass on which she had set her heart."
"Wax-lights stood on the mantelpiece before a gilt-framed pierglass; coloured prints hung on the walls."