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abaptiston

[ab-ap-tis-tuh n] /ˌæb æpˈtɪs tən/
noun
1.
Surgery. a cone-shaped trephine designed to avoid penetration of the brain when incising the skull.
Origin
1690-1700
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 Dictionary, © Random House, Inc. 2014.
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