Entry 1 sense Webster, 1913 Toxicological /täkˌ-sək-əl-äj'-ĭk-əl/ · Tox·i·co·log·ic·al · IPA /tˌɑksəkəlˈɑdʒɪkəl/ 01 a. Of or pertaining to toxicology. 1. Of or pertaining to toxicology.