D defs.my
Entry 1 sense Webster, 1913

Reasoner

/(rē"z'n*ẽr)/ · Rea·son·er · IPA /rˈiːzənər/
01 n. One who reasons or argues; as, a fair reasoner; a close reasoner; a logical reasoner.
  1. 1.
    One who reasons or argues; as, a fair reasoner; a close reasoner; a logical reasoner.