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orseillic
From The Collaborative International Dictionary of English v.0.48:
Orsellic \Or*sel"lic\, a. [From F. orseille archil. See Archil.] (Chem.) Pertaining to, or designating, an acid found in certain lichens, and called also lecanoric acid. [Formerly written also orseillic.] [1913 Webster]

