The Collaborative International Dictionary of English v.0.48:

Tocology \To*col"o*gy\, n. [Gr. ? a birth + -logy.]
   The science of obstetrics, or midwifery; that department of
   medicine which treats of parturition. [Written also
   tokology.]
   [1913 Webster]

WordNet (r) 3.0 (2006):

tocology
    n 1: the branch of medicine dealing with childbirth and care of
         the mother [syn: obstetrics, OB, tocology,
         midwifery]