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tung'stic ac'id

1. a hydrate of tungsten trioxide, H2WO4·H2O, used in the manufacture of tungsten-lamp filaments.
2. any of a group of acids derived from tungsten by the addition of acid to a soluble tungstate or to a mixture of a tungstate and a silicate, phosphate, etc.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

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