The amount of liquid or material that a basin can hold; a basin's capacity.
Compound word formed from 'basin' (a wide, shallow container) and the suffix '-ful' (meaning the capacity to hold). This follows the English pattern of measuring quantities by container size.
Before we had measuring cups, basinful was actually how people described recipe quantities—so when old recipes say 'add two basinsfuls of water,' they meant whatever their specific basin could hold!
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