Word Study
    octa-
CIDE DICTIONARY
octa-,  
                                            
                                         A prefix meaning eight . See Octo-.                                                                                 [1913 Webster]                                                                                                                    
                                                                                    octa-,  [L. octo eight, Gr. 'oktw`, with a combining form 'okta-.  Cf. Eight.]. 
                                            
                                         A combining form meaning eight ; as in octodecimal, octolocular.                                                                                 [1913 Webster]                                                                                                                    
                                                                                    OXFORD DICTIONARY
octa-, comb. form (also oct- before a vowel) eight.
                    Etymology
                        Gk okta- f.  okto eight
                                    
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