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Meaning of hard mass

hard' mass'

Pronunciation: [key]
  1. a hard glass used for imitating gemstones.
  2. (not in technical use)
    1. any glass for imitating gemstones, esp. emerald.
    2. any of certain synthetic gemstones.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.