tortoise-core

American  

[tawr-tuhs-kawr, -kohr] / ˈtɔr təsˌkɔr, -ˌkoʊr /

noun

1. 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.

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Etymology

Origin of tortoise-core

First recorded in 1915–20