Source : Webster's Revised Unabridged Dictionary (1913)

Lexicographic \Lex`i*co*graph"ic\ (-k[-o]*gr[a^]f"[i^]k),
Lexicographical \Lex`i*co*graph"ic*al\ (-[i^]*kal), a. [Cf. F.
   lexicographique.]
   Of or pertaining to, or according to, lexicography. --
   {Lex`i*co*graph"ic*al*ly}, adv.

Source : WordNet®

lexicographical
     adj : of or relating to lexicography [syn: {lexicographic}]