D defs.my
Entry 4 senses Webster, 1913

Leader

/lēd'-ẽr/ · Lead·er · IPA /ˈli.dɚ/
01 n. One who, or that which, leads or conducts; a guide; a conductor.
  1. 1.
    One who, or that which, leads or conducts; a guide; a conductor.(Mus.) [Obs. or R.]
    “He forgot to pull in his leaders, and they gallop away with him at times.” — Hare.
  2. 2.
    A pipe for conducting rain water from a roof to a cistern or to the ground; a conductor.(Fishing)
  3. 3.
    The first, or the principal, editorial article in a newspaper; a leading or main editorial article.
  4. 4.
    A type having a dot or short row of dots upon its face.(Print.)