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spiral
SYNONYMS OR RELATED TERMS: spira
CATEGORY: artifact
DEFINITION: A widely popular artistic motif, consisting of a curve of constantly increasing diameter; any motif which is coiled or curling. A double spiral is one in which two spirals are conjoined at the center. A running spiral is a series of regularly interconnected spirals.
spiral fracture
CATEGORY: term
DEFINITION: Type of bone fracture where the breakage curves along and around the shaft. It is seen by some specialists as diagnostic of human use of bones for tools.
spiral nail
CATEGORY: artifact
DEFINITION: A nail that tended to turn into the wood like a screw as it is driven home, used in flooring to assure a tight and squeak-proof joining

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