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Webster 1913 Edition

Noun.

;

pl.

Glassfuls

The contents of a glass; as much of anything as a glass will hold.

Adj.

Glassy; shining like glass.

[Obs.]

“Minerva’s glassful shield.”

Marston.

glassful ‎(plural glassfuls or glassesful)

amount that a glass will hold

glassful ‎(comparative more glassful, superlative most glassful)

(obsolete) glassy; shining like glass.
Minerva's glassful shield. — Marston.