impleader

Century Dictionary and Cyclopedia

1. n. One who impleads or prosecutes another; an accuser; an impeacher.

Wiktionary

1. n. law A procedural device before trial in which a party joins a third-party into a lawsuit because that third-party is liable to an original defendant.

GNU Webster's 1913

1. n. (Law) One who prosecutes or sues another.