This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Of, relating to, or based on the number eight: an octal number system.

n. The number system that uses the eight digits 0, 1, 2, 3, 4, 5, 6, 7.

adj. Concerning numbers expressed in octal or mathematical calculations performed using octal.

adj. of or pertaining to a number system having 8 as its base

"This, written in octal, gives 666 - the number of the Beast."

binary    hexadecimal    base    decimal   

octonary    base   

hexadecimal    4-digit    phase-shift    two-letter    rightmost    diagrammatic    scientiwc    8-digit    most-significant    7-bit