- Fine-grained, dense sedimentary rock consisting of interlocking crystals of quartz approximately 30 microns in diameter. Chert and its varieties, such as flint, are non-gem varieties of cryptocrystalline-granular quartz. These stones chip very easily and thus may be fashioned into tools with a sharp edge; they are also used for building.
- Separating into thin flattened pieces or layers.
- Cutting instruments consisting of a blade with a sharpened longitudinal edge fixed in a handle, either rigidly as in a table-, carving, or sheath-knife, or with a joint as in a pocket- or clasp-knife. Knives may be used to cut food, especially in serving and eating, as weapons, and for other purposes. The blade may be of steel or another metal or stone, as in the flint knives of early man, or of another material such as ivory or wood (as with a paperknife). The term also refers to tools that are shaped or used as knives, even if the edge is not particularly sharp or actually used for cutting.
- Typically reserved to refer narrowly to the cultures of the native peoples of the United States and Canada, excluding the Eskimos and Aleuts. For the indigenous peoples of Canada use the term "First Nations." For the broader concept of the cultures of any native peoples of Central America, South America, North America, or the West Indies who are considered to belong to the Mongoloid division of the human species, use "Amerindian (culture)."
- Refers to the cultures of the continent of North America, which is bounded by the Atlantic Ocean, the Pacific Ocean, the Arctic Circle, and Central America. In classifications schemes based on physical geography, Central America, and North America are parts of the same continent.
- Any of various tools used for scraping, producing a clean or a smooth finished surface, cutting grooves, or shaping objects by scraping away superfluous material.
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