An archaic or variant plural form of clivus; slopes or inclines (anatomical or architectural).
From Latin clivus meaning 'slope' or 'hill,' with Latin plural -is. This form appears in older anatomical or architectural texts.
Latin plurals survive in medical terminology even though we don't speak Latin anymore—so 'clivis' sounds archaic today, but it reminds us that science inherited its language from classical Rome.
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