Entry 1 sense Webster, 1913 Thanatology /(thăn`ȧ*tŏl"ō̇*jy̆)/ · Than·a·tol·o·gy · IPA /ˌθæ.nəˈtɑl.əd͡ʒ.i/ 01 n. A description, or the doctrine, of death. 1. A description, or the doctrine, of death.