abaptiston

[ ab-ap-tis-tuh n ]
/ ˌæb æpˈtɪs tən /

noun

Surgery. a cone-shaped trephine designed to avoid penetration of the brain when incising the skull.

Origin of abaptiston

1690–1700; < Greek (trýpanon) abáptiston (trepan) not dipped, neuter of abáptistos, equivalent to a- a-6 + baptis-, variant stem of baptízein to immerse (see baptize) + -tos verbal adjective suffix
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019