pithecological,a.nonce-wd.|pɪθiːkəʊˈlɒdʒɪkəl| [f.Gr. πίθηκος ape + -logical.] Pertaining to the scientific study of apes. 1865Visct. Strangford Selection (1869) II. 110 Its proceedings..were not of a truly geographical, so much as of a more or less authentically pithecological, character.