D defs.my
Entry 2 senses Webster, 1913

Postmaster

/pōs'-tmăsˌ-tẽr/ · Post·mas·ter · IPA /ˈpoʊstˌmæstɚ/
01 n. One who has charge of a station for the accommodation of travelers; one who supplies post horses.
  1. 1.
    One who has charge of a station for the accommodation of travelers; one who supplies post horses.
  2. 2.
    One who has charge of a post office, and the distribution and forwarding of mails.