malacology

from WordNet (r) 3.0 (2006)

malacology
    n 1: the branch of zoology that studies the structure and
         behavior of mollusks

from The Collaborative International Dictionary of English v.0.48

Malacology \Mal`a*col"o*gy\, n. [Gr. malako`s soft + -logy: cf.
   F. malacologie.]
   The science which relates to the structure and habits of
   mollusks.
   [1913 Webster]