movement towards or away from water
The movement of cells or organisms in relation to water. ... Origin: hydro-+ G. Taxis, arrangement ... (05 Mar 2000) ... 
(hi″dro-tak´sis) taxis of motile organisms or cells in response to the influence of water or moisture.
Type: Term Pronunciation: hī′drō-tak′sis Definitions: 1. The movement of cells or organisms in relation to water.
oriented movement toward or away from water.