The Collaborative International Dictionary of English v.0.48:

Latten \Lat"ten\, n. [OE. latoun, laton, OF. laton, F. laiton,
   prob. fr. OF. late lath, F. latte; -- because made in thin
   plates; cf. It. latta a sheet of tinned iron, tin plate. F.
   latte is of German origin. See Lath a thin board.]
   [1913 Webster]
   1. A kind of brass hammered into thin sheets, formerly much
      used for making church utensils, as candlesticks, crosses,
      etc.; -- called also latten brass.
      [1913 Webster]

            He had a cross of latoun full of stones. --Chaucer.
      [1913 Webster]

   2. Sheet tin; iron plate, covered with tin; also, any metal
      in thin sheets; as, gold latten.
      [1913 Webster]

   Black latten, brass in milled sheets, composed of copper
      and zinc, used by braziers, and for drawing into wire.

   Roll latten, latten polished on both sides ready for use.


   Shaven latten, a thinner kind than black latten.

   White latten, a mixture of brass and tin.
      [1913 Webster]

WordNet (r) 3.0 (2006):

latten
    n 1: brass (or a yellow alloy resembling brass) that was
         hammered into thin sheets; formerly used for church
         utensils