Source : Webster's Revised Unabridged Dictionary (1913)

Punctum \Punc"tum\, n. [L., a point.]
   A point.

   {Punctum c[ae]cum}. [L., blind point.] (Anat.) Same as {Blind
      spot}, under {Blind}.

   {Punctum proximum}, near point. See under {Point}.

   {Punctum remotum}, far point. See under {Point}.

   {Punctum vegetationis} [L., point of vegetation] (Bot.), the
      terminal cell of a stem, or of a leaf bud, from which new
      growth originates.

Source : WordNet®

punctum
     n : (anatomy) a point or small area