The Collaborative International Dictionary of English v.0.48:

Leptology \Lep*tol"o*gy\ (l[e^]p*t[o^]l"[-o]*j[y^]), n. [Gr.
   leptologi`a; lepto`s small, subtile + lo`gos discourse.]
   A minute and tedious discourse on trifling things.
   [1913 Webster]