Concho-spiral Con`cho-spi"ral, n. A kind of spiral curve found in certain univalve shells. --Agassiz. [1913 Webster]

The Collaborative International Dictionary of English. 2000.

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  • conchospiral — conchoˈspiral [f. Gr. κογχο (see conchology) + spiral.] A kind of spiral curve exemplified in shells. Webster cites Agassiz …   Useful english dictionary

  • Conchospiral — In mathematics, a conchospiral is a three dimensional spiral. In cylindrical coordinates, it is described by the parametric equations: r = μta θ = t z = μtc. The projection of a conchospiral on the (r, θ) plane is a logarithmic spiral. External… …   Wikipedia

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