The complete amount of liquid or material that a boiler can hold when completely filled.
Compound of 'boiler' (from 'boil' plus agent suffix '-er', meaning a vessel for boiling) and '-ful' (from Old English 'full', meaning filled or containing). A productive English pattern for measuring capacity.
The '-ful' suffix is tricky—a spoonful isn't actually one spoon, it's what fits in one spoon. Similarly, a boilerful is what fills a boiler, and you can have multiple boilerfuls because '-ful' refers to the measure, not one container.
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