Main Entry: ste·reo·tac·tic

Pronunciation: \ˌster-ē-ə-ˈtak-tik, ˌstir-\

Function: adjective

: involving, being, utilizing, or used in a surgical technique for precisely directing the tip of a delicate instrument (as a needle) or beam of radiation in three planes using coordinates provided by medical imaging (as computed tomography) in order to reach a specific locus in the body (as a tumor in the brain or breast) <a stereotactic biopsy> <a stereotactic surgical probe>

—ste·reo·tac·ti·cal·ly \-ti-k(ə-)lē\ adverb