Relating to or characteristic of curvature; having the nature or quality of a curve.
From Latin 'curvus' (curved) with the rare suffix '-ital' (relating to). This appears in very specialized mathematical and philosophical texts from the 17th-18th centuries.
This word is so archaic that even most academic databases barely register it, but it represents how early mathematicians tried to create precise language before 'curvilinear' became the standard term.
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