Spiral of Archimedes
Spiral Spi"ral, n. [Cf. F. spirale. See {Spiral}, a.] 1. (Geom.) A plane curve, not re["e]ntrant, described by a point, called the generatrix, moving along a straight line according to a mathematical law, while the line is revolving about a fixed point called the pole. Cf. {Helix}. [1913 Webster]

2. Anything which has a spiral form, as a spiral shell. [1913 Webster]

{Equiangular spiral},a plane curve which cuts all its generatrices at the same angle. Same as {Logarithmic spiral}, under {Logarithmic}.

{Spiral of Archimedes}, a spiral the law of which is that the generatrix moves uniformly along the revolving line, which also moves uniformly. [1913 Webster]

The Collaborative International Dictionary of English. 2000.

### Look at other dictionaries:

• spiral of archimedes — Usage: usually capitalized A : archimedean spiral * * * Geom. a curve that is the locus of a point that moves outward with uniform speed along a vector, beginning at the origin, while the vector rotates about the origin with uniform angular… …   Useful english dictionary

• spiral of Archimedes — noun A spiral that increases in distance from the point of origin at a constant rate. Syn: Archimedean spiral, arithmetic spiral …   Wiktionary

• spiral of Archimedes — Geom. a curve that is the locus of a point that moves outward with uniform speed along a vector, beginning at the origin, while the vector rotates about the origin with uniform angular velocity. Equation (in polar coordinates): r = a t. [1650 60; …   Universalium

• spiral of Archimedes — Etymology: Archimedes Date: circa 1856 a plane curve that is generated by a point moving away from or toward a fixed point at a constant rate while the radius vector from the fixed point rotates at a constant rate and that has the equation ρ = a… …   New Collegiate Dictionary

• Spiral — Spi ral, n. [Cf. F. spirale. See {Spiral}, a.] 1. (Geom.) A plane curve, not re[ e]ntrant, described by a point, called the generatrix, moving along a straight line according to a mathematical law, while the line is revolving about a fixed point… …   The Collaborative International Dictionary of English

• Archimedes — /ahr keuh mee deez/, n. 287? 212 B.C., Greek mathematician, physicist, and inventor: discovered the principles of specific gravity and of the lever. * * * born с 290–280 BC, Syracuse, Sicily died 212/211 BC, Syracuse Legendary Greek inventor and… …   Universalium

• spiral — spirality /spuy ral i tee/, n. spirally, adv. /spuy reuhl/, n., adj., v., spiraled, spiraling or (esp. Brit.) spiralled, spiralling. n. 1. Geom. a plane curve generated by a point moving around a fixed point while constantly receding from or… …   Universalium

• Archimedes' spiral —    Also known as Plateau s spiral. The eponym Archimedes spiral refers to the Greek mathematician and physicist Archimedes of Syracuse (297 212 BC). The eponym Plateau s spiral refers to the Belgian physicist Joseph Plateau (18011883). Both… …   Dictionary of Hallucinations

• Archimedes — For other uses, see Archimedes (disambiguation). Archimedes of Syracuse (Greek: Ἀρχιμήδης) …   Wikipedia

• Archimedes Palimpsest — The Archimedes Palimpsest is a palimpsest on parchment in the form of a codex which originally was a copy of an otherwise unknown work of the ancient mathematician, physicist, and engineer Archimedes of Syracuse and other authors. Archimedes… …   Wikipedia