[ad. L. corrūgāt-us, pa. pple. of corrūgāre: see next.] Wrinkled; contracted into folds or wrinkles. Also fig.
1742. Young, Nt. Th., ix. 1382. Extended views a narrow mind extend; Push out its corrugate, expansive make.
1840. New Monthly Mag., LVIII. 458. Howard … with corrugate brow now consigned Parolles to the ‘shelf.’
b. spec. in Bot. and Zool. Having a wrinkled appearance; marked with parallel ridges and furrows, usually wavy or curved.
1826. Kirby & Sp., Entomol. (1828), IV. xxxviii. 38. The surface frequently appears to be corrugate or plaited.
1880. Gray, Struct. Bot., iv. § 2. 133. Corrugate or Crumpled, as the petals of a Poppy, applies to the irregular crumpling of the otherwise plane corolla-leaves.
