Is it farther or further?
stereotaxis ster·e·o·tax·is (stěr'ē-ə-tāk'sĭs, stēr'-) or ster·e·o·tax·y (stěr'ē-ə-tāk'sē, stēr'-)
A method in neurosurgery and neurological research for precisely locating points within the brain using an external, 3-dimensional frame of reference. Also called stereoencephalotomy, stereotactic surgery.
Movement of an organism in response to contact with a solid body. Also called thigmotaxis.