Pit″ta‐cal (pĭt″tȧ‐kăl), n. [Gr. πίττα, πίσσα, pitch + καλόσ beautiful: cf. F. pittacale.] (Chem.) A dark blue substance obtained from wood tar. It consists of hydrocarbons which when oxidized form the orange-yellow eupittonic compounds, the salts of which are dark blue.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.