or·gan·ot·ro·pism 
(ôr′gə-nŏtrə-pĭz′əm) also or·gan·ot·ro·py (-pē)
(ôr′gə-nŏtrə-pĭz′əm) also or·gan·ot·ro·py (-pē)n.
The attraction of certain chemical compounds or microorganisms to specific tissues or organs of the body.
or′gan·o·tropic (ôr′gə-nō-trōpĭk, ôr-găn′ō-) adj.