• Webster's Revised Unabridged Dictionary
    • n Frostwork The figurework, often fantastic and delicate, which moisture sometimes forms in freezing, as upon a window pane or a flagstone.
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Century Dictionary and Cyclopedia
    • n frostwork The beautiful covering of hoar frost deposited on shrubs or other objects, and with the finest effects on windows.
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In literature:

When they are real, they are not glass threads or frostwork, but the solidest thing we know.
"Essays, First Series" by Ralph Waldo Emerson
Frostwork is something too delicate for human hands, but in it we excel.
"Prince Lazybones and Other Stories" by Mrs. W. J. Hays
And that lace is as delicate as frostwork!
"The Court Jester" by Cornelia Baker