Plural of glassful; multiple amounts of liquid, each equal to what one glass can hold.
From 'glassful' + '-s' (plural suffix). Follows standard English pluralization for '-ful' words.
Interestingly, 'glassfuls' and 'glasses full' are both correct plurals, but 'glassfuls' treats the whole thing as one unit while 'glasses full' treats them as separate glasses—it's a fun grammar debate!
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