tortoise-core

[tawr-tuhs-kawr, -kohr]

tor·toise-core

[tawr-tuhs-kawr, -kohr]
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.

Origin:
1915–20
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Tortoise-core is always a great word to know.
So is flibbertigibbet. Does it mean:
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
a chattering or flighty, light-headed person.
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