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abaptiston

American  
[ab-ap-tis-tuhn] / ˌæb æpˈtɪs tən /

noun

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


Etymology

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 ( baptize ) + -tos verbal adjective suffix