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Definition of peta- combining form from the Oxford Advanced Learner's Dictionary

peta-

combining form
 
/petə/
 
/petə/
(specialist)
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  1. (in nouns; used in units of measurement) 1015; one thousand million million
    Word Originfrom pe(n)ta-, from Greek pente ‘five’ (see penta-); based on the supposed analogy of tera- and tetra-.
See peta- in the Oxford Advanced American Dictionary
Check pronunciation: peta-

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