spiral arm

spiral arm
any of the elongated and curved spiral sections that are connected to the center of a spiral galaxy.
[1910-15]

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Universalium. 2010.

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  • Spiral fracture — An x ray image of a spiral fracture to the left humerus of a 27 year old male. The injury was sustained during a fall. A spiral fracture (a.k.a. torsion fracture) is a bone fracture occurring when torque is applied along the axis of a bone.[1]… …   Wikipedia

  • spiral — spi|ral1 [ spaırəl ] noun count * 1. ) a shape that looks like a set of circles inside each other, made by one line curving inside itself a ) a shape made by something that curves around a central line or post and along its length 2. ) a… …   Usage of the words and phrases in modern English

  • Spiral Jetty — The Spiral Jetty , considered to be the central work of American sculptor Robert Smithson, is an earthwork sculpture constructed in 1970.Built of mud, salt crystals, basalt rocks, earth, and water on the northeastern shore of the Great Salt Lake… …   Wikipedia

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  • spiral spring — Spring Spring, n. [AS. spring a fountain, a leap. See {Spring}, v. i.] 1. A leap; a bound; a jump. [1913 Webster] The prisoner, with a spring, from prison broke. Dryden. [1913 Webster] 2. A flying back; the resilience of a body recovering its… …   The Collaborative International Dictionary of English

  • Spiral Staircase — Compact staircase often built into the walls of castles. Usually designed so that attackers climbing a clockwise staircase would find it hard to fight with their right hand, whilst descending defenders would have their right (sword) arm free …   Medieval glossary

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