Definition of terebra
1 plural terebras \-brəz\ or terebrae \-ē(ˌ)brē; -ə(ˌ)brē, -əˌbrī\ : a device used by the ancient Romans for starting a breach in a fortified wall
2 [New Latin, from Latin, borer] a plural -s : the boring ovipositor of a hymenopterous insect b capitalized : a genus of marine gastropods (suborder Stenoglossa) having a long tapering spire and being the type of a family Terebridae comprising the auger shells c -s : auger shell
terebral\təˈrēbrəl, ˈterəb-\ adjective
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Origin and Etymology of terebra
Latin, borer, gimlet, from terere to rub, grind + -bra, suffix denoting an instrument — more at throw
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