The quantity that a fountain holds or can produce; an abundance or overflow.
From fount + -ful suffix indicating capacity or quantity. The -ful suffix comes from Old English full (abundance) and creates nouns measuring how much something can hold.
Words with -ful can be nouns (spoonful, mouthful) or adjectives (beautiful, careful), and 'fountful' uses the noun form to suggest abundance—like a fountain overflowing with water.
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