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Webster 1913 Edition

Adj.

Of or pertaining to an arc.

Arcual measure of an angle

(Math.)

that in which the unit angle has its measuring arc equal to the radius of the circle.

arcual ‎(not comparable)

Of or pertaining to an arc.
The arcual measure of an angle is that in which the unit angle has its measuring arc equal to the radius of the circle.

of or pertaining to an arc

arcual m, f ‎(plural arcuais, comparable)