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Meaning of tortoise-core

tor•toise-core

Pronunciation: (tôr'tus-kôr", -kōr"), [key]
— n.
  1. a late Lower and Middle Paleolithic stone core characteristic of the Levalloisian tradition of toolmaking, having a rounded top and flattish bottom and prepared in advance to permit the removal of a single ellipsoid flake with one blow from a stone hammer.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.