D defs.my
Entry 2 senses Webster, 1913

Billboard

/bĭl'-bôrdˌ/ · Bill·board · IPA /ˈbɪlˌboɹd/
01 n. A piece of thick plank, armed with iron plates, and fixed on the bow or fore channels of a vessel, for the bill or fluke of the anchor to r…
  1. 1.
    A piece of thick plank, armed with iron plates, and fixed on the bow or fore channels of a vessel, for the bill or fluke of the anchor to rest on.(Naut.)
  2. 2.
    A flat surface, as of a panel or of a fence, on which bills are posted; a bulletin board.