The Collaborative International Dictionary of English v.0.48:

Pencil \Pen"cil\, v. t. [imp. & p. p. Penciledor Pencilled;
   p. pr. & vb. n. Penciling or Pencilling.]
   To write or mark with a pencil; to paint or to draw.
   --Cowper.
   [1913 Webster]

         Where nature pencils butterflies on flowers. --Harte.
   [1913 Webster]

   pencil in to write (a tentative appoinment) on an
      appointment calendar, so as to reserve time, but to allow
      the appointment to be readily canceled and replaced with
      another; -- also used figuratively, with other means of
      recording appointments. The notion being that something
      written in pencil can be more easily changed than
      something written in ink. The phrase is commonly used in
      the early stages of organizing a meeting of multiple
      persons, before it is known whether all attendees will be
      free at the suggested time.
      [PJC]

WordNet (r) 3.0 (2006):

pencilled
    adj 1: drawn or written with a pencil; "a penciled sketch"; "the
           penciled message" [syn: penciled, pencilled]