The Collaborative International Dictionary of English v.0.48:

Nog \Nog\, v. t. [From 2d Nog.]
   1. To fill in, as between scantling, with brickwork.
      [1913 Webster]

   2. (Shipbuilding) To fasten, as shores, with treenails.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Nog \Nog\, n. [Abbrev. fr. noggin.]
   1. A noggin.
      [1913 Webster]

   2. A kind of strong ale. --Halliwell.
      [1913 Webster]

   3. eggnog.
      [PJC]

   egg nog A drink make from eggs beaten with milk, cream, and
      sugar, often spiked with rum or other alcoholic liquor,
      and sometimes seasoned with cinnamon; usually spelled
      eggnog. It is a traditional drink served at social
      gatherings during the Christmas season.
      [PJC]

The Collaborative International Dictionary of English v.0.48:

Nog \Nog\, n. [Etymol. uncertain.]
   1. A wooden block, of the size of a brick, built into a wall,
      as a hold for the nails of woodwork.
      [1913 Webster]

   2. One of the square logs of wood used in a pile to support
      the roof of a mine.
      [1913 Webster]

   3. (Shipbuilding) A treenail to fasten the shores.
      [1913 Webster]

WordNet (r) 3.0 (2006):

nog
    n 1: a wooden pin pushed or driven into a surface [syn: peg,
         nog]
    2: a wooden block built into a masonry wall so that joinery
       structure can be nailed to it