описторхоз(the presence in any of the organs or tissues of digenetic flukes formerly classified as Distoma or Distomum; in general, infection by any parasitic trematode or fluke)
опистогирный(applied to the umbones [hooked prominences occurring at the apex of each half of the shell] of bivalve molluscs [Bivalvia] where these are so curved as to point in a posterior direction.)