1] of or for an ass, turned by an ass
   1.a] these beasts were often employed to turn millstones [see photo]
derivation: from (3688)
http://bible.crosswalk.com/Lexicons/Greek/grk.cgi?number=3684&version=kjv

(3688)
1] an ass
derivation: apparently a root word
http://bible.crosswalk.com/Lexicons/Greek/grk.cgi?number=3688&version=kjv

A link to each occurrence of this word in the homepage:
1] millstone