octa

octa-

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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World English Dictionary
octa (ˈɒktə)
 
n
a variant spelling of okta

octa-
 
combining form
a variant of octo-

okta or octa (ˈɒktə)
 
n
a unit used in meteorology to measure cloud cover, equivalent to a cloud cover of one eighth of the sky
 
[C20: from Greek okta-, oktō eight]
 
octa or octa
 
n
 
[C20: from Greek okta-, oktō eight]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

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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