Stone Age Period of human evolution defined by the use of stone tools. The Stone Age dates from the earliest identifiable broken-pebble tools made by human ancestors c.2.5 million years ago. The period is generally considered to have ended when metal tools first became widespread during the Bronze Age. The Stone Age usually subdivides into the Palaeolithic, Mesolithic, and Neolithic.
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Paleolithic , Pa·le·o·lith·ic / ˌpālēəˈli[unvoicedth]ik/ • adj. Archaeol. of, relating to, or denoting the early phase of the Stone Age, lasting about 2.5 million… Eolithic , E·o·lith·ic / ˌēəˈli[unvoicedth]ik/ • adj. dated Archaeol. of, relating to, or denoting a period at the beginning of the Stone Age, preceding the Pal… Stone , stone / stōn/ • n. 1. the hard, solid, nonmetallic mineral matter of which rock is made, esp. as a building material: the houses are built of stone |… cairn , cairn / ke(ə)rn/ • n. 1. a mound of rough stones built as a memorial or landmark, typically on a hilltop or skyline. ∎ a prehistoric burial mound mad… Kidney Stones , Kidney stones are composed of crystals formed by chemicah that separate from the urine and that build up in the kidney. Most kidney stones pass out o… George Whetstone , whetstone •flagstone, ragstone •Blackstone, jackstone •sandstone • capstone • hearthstone •headstone • gemstone • whetstone •hailstone • gravestone •…
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