Plural of health; multiple instances or types of wellness, or toasts to someone's wellbeing.
From 'health' (Old English 'hælth', meaning whole or sound state) with the regular plural '-s' suffix; historically used in phrases like 'drink healths' meaning to make toasts.
In old tavern culture, people would 'drink healths'—literally raising glasses and saying someone's name to wish them wellness—which is why 'healths' as a countable noun survives in historical contexts, showing how abstract nouns can become countable when they're ceremonial!
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