Longman Dictionary of Contemporary English homepage

Language: Latin
Origin: extra 'outside', from exter; EXTERNAL

extra-

 prefix
     
extra-
1 outside or beyond:
extragalactic (=outside our galaxy)
extracellular (=outside a cell)
2 informal very or more than normal:
extra-large
extra-strong
extra-special
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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