Of, pertaining to, or of the nature of an arc; arcuate.
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the world > space > shape > curvature > types of curvature > [adjective] > of form of arc of circle
arcual1642
arcular1797
1642 H. MoreΨυχωδια Platonica sig. L2v Its [sc. An arrow's] circular course hath bended Toward the East, and in proportion due That arcuall Eastern motion did pursue.
1867 G. F. ChambersDescr. Astron.vii. i. 623 The arcual value corresponding to each.
This entry has not yet been fully updated (first published 1885; most recently modified version published online September 2018).