ster·e·o·tax·is 
(stĕr′ē-ə-tăksĭs, stîr′-) also ster·e·o·tax·y (stĕrē-ə-tăk′sē, stîr-)
(stĕr′ē-ə-tăksĭs, stîr′-) also ster·e·o·tax·y (stĕrē-ə-tăk′sē, stîr-)n.
A method in neurosurgery and neurological research for locating points within the brain using an external, three-dimensional frame of reference usually based on the Cartesian coordinate system.
ster′e·o·tactic (-tăktĭk), ster′e·o·taxic (-tăksĭk), ster′e·o·tacti·cal (-tăktĭ-kəl), ster′e·o·taxi·cal (-tăksĭ-kəl) adj.
ster′e·o·tacti·cal·ly, ster′e·o·taxi·cal·ly adv.