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).
Origin of octa-
< Greek okta-, combining form of oktṓ eight
Words nearby octa-
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020
Example sentences from the Web for octa
The incautious sovereign having assented to this, Octa and Ebusa arrived with forty ships.
After this Eosa and the rest that fled, being encouraged by Octa's success, came also, and were admitted to the same favour.
British Dictionary definitions for octa (1 of 2)
/ (ˈɒktə) /
a variant spelling of okta
British Dictionary definitions for octa (2 of 2)
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