The plural of 'hatful,' meaning the amount that a hat can hold; multiple quantities of something that fills a hat.
From 'hat' (headwear) plus '-ful' (the amount that fills or contains something). This combines a concrete noun with a suffix for quantity, following patterns like 'handful,' 'spoonful,' and 'cupful.'
The plural of '-ful' words is tricky in English: it's 'hatsful' not 'hatsfuls,' because technically we're measuring multiple hat-amounts, not multiple hats. This quirk shows how English pluralization rules were designed before we standardized measurements!
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