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octa-

1.
a combining form occurring in loanwords from Greek and Latin, where it meant “eight” (octagon; octastyle), on this model, used in the formation of compound words, and in chemical terms specialized to mean “having eight atoms” (octavalent).
Also, oct-, octo-.
Origin
< Greek okta-, combining form of oktṓ eight
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for octa

octa

/ˈɒktə/
noun
1.
a variant spelling of okta

okta

/ˈɒktə/
noun
1.
a unit used in meteorology to measure cloud cover, equivalent to a cloud cover of one eighth of the sky
Word Origin
C20: from Greek okta-, oktō eight

octa-

combining form
1.
a variant of octo-
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for octa
octa-
prefix meaning "eight," from L. octo, Gk. okto-, cognate with Skt. asta, Goth. ahtau, O.E. eahta (see eight).
Online Etymology Dictionary, © 2010 Douglas Harper
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