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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
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for octa-

octa-

combining form
1.
a variant of octo-

octo-

combining form
1.
eight: octosyllabic, octagon
Word Origin
from Latin octo, Greek okto
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for octa-

before vowels oct-, word-forming element meaning "eight," from Greek okta-, okt-, from PIE *okto(u) "eight" (see eight). The variant form octo- often appears in words taken from Latin, but the Greek form is said to be the more common in English.

Online Etymology Dictionary, © 2010 Douglas Harper
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