The Collaborative International Dictionary of English v.0.48:

Templet \Tem"plet\, n. [LL. templatus vaulted, from L. templum a
   small timber.] [Spelt also template.]
   1. A gauge, pattern, or mold, commonly a thin plate or board,
      used as a guide to the form of the work to be executed;
      as, a mason's or a wheelwright's templet.
      [1913 Webster]

   2. (Arch.) A short piece of timber, iron, or stone, placed in
      a wall under a girder or other beam, to distribute the
      weight or pressure.
      [1913 Webster]

WordNet (r) 3.0 (2006):

templet
    n 1: a model or standard for making comparisons [syn:
         template, templet, guide]