Plural of achiness; multiple instances or types of bodily aches.
Simple plural formation from 'achiness' by adding '-es'. Used when discussing multiple episodes or different types of aches in medical or colloquial contexts.
While grammatically correct, 'achinesses' is so rare that most people say 'periods of achiness' instead—it's a word that perfectly demonstrates how English plural forms exist even when we almost never use them!
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