The Collaborative International Dictionary of English v.0.48:

manger \man"ger\, n. [F. mangeoire, fr. manger to eat, fr. L.
   manducare, fr. mandere to chew. Cf. Mandible, Manducate.]
   1. A trough or open box in which fodder is placed for horses
      or cattle to eat.
      [1913 Webster]

            And she brought forth her firstborn son, and wrapped
            him in swaddling clothes, and laid him in a manger;
            because there was no room for them in the inn.
                                                  --Luke 2: 7
      [PJC]

   2. (Naut.) The fore part of the deck, having a bulkhead
      athwart ships high enough to prevent water which enters
      the hawse holes from running over it.
      [1913 Webster]

WordNet (r) 3.0 (2006):

manger
    n 1: a container (usually in a barn or stable) from which cattle
         or horses feed [syn: manger, trough]