Plural of algidity; instances or qualities of being cold or the state of coldness.
From algid plus the suffix -ity (creating an abstract noun) plus -ies (plural). The chain shows how Latin-derived medical terminology builds complex words from simple roots.
Medical historians find 'algidities' in 18th-century fever case notes, where doctors meticulously recorded temperature variations—this vocabulary helped develop modern clinical thermometers.
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