[ad. L. type *corrūgātiōn-em, f. corrūgāre to CORRUGATE.]
1. The action of corrugating or state of being corrugated; contraction into wrinkles, folds or ridges.
1528. Paynel, Salerne’s Regim., D ij b. Verye hunger cometh by contraction and corrugation of the veynes procedynge from the mouth of the stomake.
1615. Crooke, Body of Man, 745. The skinne of the forehead (which by his tension and corrugation … demonstrateth the manifold affections of the mind).
1710. T. Fuller, Pharm. Extemp., 22. Convulsive Corrugations of the Fibres.
1836. Todd, Cycl. Anat., I. 225/1. Strong acids applied to arteries produce a corrugation or crisping of their structure.
2. concr. A wrinkle, fold, furrow or groove formed by the contraction of a soft surface or the indenting of a hard one.
1829. [J. L. Knapp], Jrnl. Naturalist, 53. An oak with all the corrugations, twistings, furrows, and irregularities, which this tree … generally exhibits.
1857. H. Miller, Test. Rocks, 224. Another element of strength,—that which has of late been introduced into iron roofs, which by means of their corrugations … are made to span over wide spaces, without the support of beams or rafters.
1872. C. King, Mountain. Sierra Nev., i. 1. A succession of mountain chains folded in broad corrugations.
