spiral

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spiral

 [spi´ral]
1. winding like the thread of a screw; called also helical.
2. a winding structure; see also coil and helix.
Curschmann's s's coiled fibrils of mucin sometimes found in the sputum of patients with asthma. See also Laënnec's pearls.

spi·ral

(spī'răl),
1. Coiled; winding around a center like a watch spring; winding and ascending like a wire spring.
2. A structure in the shape of a coil.
[Mediev. L. spiralis, fr. G. speira, a coil]

spi·ral

(spī'răl)
1. Coiled; winding around a center like a watch spring; winding and ascending like a wire spring.
2. A structure in the shape of a coil.
[Mediev. L. spiralis, fr. G. speira, a coil]

spi·ral

(spī'răl)
1. Coiled; winding around a center like a watch spring; winding and ascending like a wire spring.
2. Structure in shape of a coil.
[Mediev. L. spiralis, fr. G. speira, a coil]
References in periodicals archive ?
The main objectives of this paper are to: 1) demonstrate the assumption that avoiding the conversion of logs with a certain large spirality value measured on the log surface would reduce the number of twist-prone studs significantly; and 2) describe applied methodologies for measuring the spiral grain under the bark on the trunks of trees and on logs.
The fabric quality is better than expected and the residual shrinkage, as well as, the spirality are for all fabric types less than 5%.
An extensive number of tests shows the efficiency of BRIO (r) treatment for the dimensional stabilization of knits: shrinkage values up to 20% with constantly near-zero residuals after washing tests, substantial reduction of residual spirality in tubular knits, volume and good hand effect, with the undisputable advantages of a flat, tensionless process, performed in semi-open width in complete absence of pilling or imperfections whatsoever.