Legal Dictionary
Main Entry:
im·plead·erPronunciation:
im-'plE-d&rFunction:
noun : the act or procedural device of impleading a third party;
specifically : a petition or complaint brought in a lawsuit by a plaintiff or defendant against a third party who may be liable to that plaintiff or defendant called also
third-party practice —compare
COUNTERCLAIM,
CROSS-CLAIM,
INTERPLEADER,
INTERVENTION,
JOINDER
[im-plee-der] 
dər