GNU Collaborative International Dictionary of English

Found one definition 

  1.       

    Puncheon , n. [F. poinçon awl, bodkin, crown, king-post, fr. L. punctio a pricking, fr. pungere to prick. See Pungent, and cf. Punch a tool, Punction.]
    1913 Webster
    1. A figured stamp, die, or punch, used by goldsmiths, cutlers, etc.
      1913 Webster
    2. (Carp.) A short, upright piece of timber in framing; a short post; an intermediate stud.
      Oxf. Gloss.

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    3. A split log or heavy slab with the face smoothed; as, a floor made of puncheons. [U.S.]
      Bartlett.

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    4. [F. poinçon, perh. the same as poinçon an awl.] A cask containing, sometimes 84, sometimes 120, gallons.
      1913 Webster