photophoresis1
/ˌfəʊtəʊfəˈriːsɪs/Physics
noun
The directional motion of small particles under the influence of light.
Origin
Early 20th century; earliest use found in Scientific Abstracts. From photo- + -phoresis, after German Photophorese.
photophoresis2
/ˌfəʊtəʊfəˈriːsɪs/Medicine
noun
= photopheresis.
Origin
1990s; earliest use found in Bone Marrow Transplantation. Alteration of photopheresis, after -phoresis.