![tortoise-core tortoise-core](https://www.tekportal.net/wp-content/uploads/2018/11/tortoise-core.jpg)
noun
- Archaeology. 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.