extra-
prefix /ekstrə/,  /ɪkˈstræ/
  /ekstrə/,  /ɪkˈstræ/
in adjectives- outside; beyond 
- extramarital sex
 - extraterrestrial beings
 
 - (informal) very; more than usual
- extra-thin
 - extra-special
 
More Like This PrefixesPrefixes- a-
 - ante-
 - anti-
 - be-
 - co-
 - de-
 - demi-
 - dis-
 - en-
 - ex-
 - extra-
 - hyper-
 - hypo-
 - il-
 - in-
 - infra-
 - inter-
 - intra-
 - mis-
 - non-
 - off-
 - oft-
 - out-
 - over-
 - para-
 - post-
 - pre-
 - pro-
 - re-
 - retro-
 - semi-
 - sub-
 - trans-
 - ultra-
 - un-
 - under-
 - up-
 
 
Word Originvia medieval Latin from Latin extra ‘outside’.