DuckCorp Dico

Found one definition

1.                 From en.wiktionary.org:
                   
   
   
                   
                     
   [sise]
   
   ** Estonian
   
   *** Etymology
   From [et], from [et].  Cognate to [fi].
   
   *** Prefix
   [et]
   
    1. A prefix signifying inner , internal , interior , inward ; indoor ; inland .
   **** Antonyms
   
    - [et]
   **** Derived terms
   
    - [et]
    - [et]