D defs.my
Entry 1 sense Webster, 1913

Thinker

/thĭng'-kẽr/ · Think·er · IPA /ˈθɪŋ.kɚ/
01 n. One who thinks; especially and chiefly, one who thinks in a particular manner; as, a close thinker; a deep thinker; a coherent thinker.
  1. 1.
    One who thinks; especially and chiefly, one who thinks in a particular manner; as, a close thinker; a deep thinker; a coherent thinker.