Pic″a‐mar′ (?), n. [L. pix, picis, pitch + amarus bitter.] (Chem.) An oily liquid hydrocarbon extracted from the creosote of beechwood tar. It consists essentially of certain derivatives of pyrogallol.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.