# Arc-back

an undesirable phenomenon, occurring in rectifier tubes, in which current flows in the reverse direction, from anode to cathode, as a result of arcing, limiting the usable voltage of the tube.

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- Arc-boutant
. Historical Examples The flying buttress, or arc-boutant is carried across by an arch from one wall to another. The Children of Westminster Abbey Rose G. Kingsley noun (pl) arcs-boutants (arkbutɑ̃) another name for flying buttress

- Arc cosecant
the angle, measured in radians, that has a cosecant equal to a given number. Symbol: csc −1. Abbreviation: arc csc; arc cosecant The inverse of the cosecant function.

- Arc cosine
Trigonometry. the angle, measured in radians, that has a cosine equal to a given number. Symbol: cos −1. Abbreviation: arc cos; arc cosine The inverse of the cosine function.

- Arc cotangent
the angle, measured in radians, that has a cotangent equal to a given number. Symbol: cot −1. Abbreviation: arc cot. arc cotangent The inverse of the cotangent function.