Of, relating to, or based on the number eight: an octal number system. (adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "octal" in a sentence
"This, written in octal, gives 666 - the number of the Beast."
"We have not seen that and most of the data converter testing we have done is at Max, what they would call octal site, I have seen some dual, some quad and some octal, but I haven't seen data converters get into strip testing at this point."
"Can these people do octal arithmetic and calculate absolute addresses for machine code jump instructions?"