Webster's Revised Unabridged Dictionary · 1913

Pleader

Pleader , noun

[French plaideur.]

1.
One who pleads; one who argues for or against; an advotate.
So fair a pleader any cause may gain. — Dryden
2.
(Law) One who draws up or forms pleas; the draughtsman of pleas or pleadings in the widest sense; as, a special pleader.