[ad. L. undulāt-us diversified as with waves, f. unda wave. Cf. Sp. undulado, F. ondulé.]
1. Furnished with wave-like markings.
1658. Phillips, Undulate, Chamolet wrought, or painted like waves.
1661. Lovell, Hist. Anim. & Min. Isagoge, The cramp-fish,… raie undulate and oculate.
1706. Phillips (ed. Kersey), Undulate, or Undulated, made in fashion of Waves, as watered Stuffs and the Grain of Wainscot.
2. Bot. and Zool. = UNDULATED ppl. a. 1.
Also comb., as undulate-convex, -serrate, etc.
a. Bot. 1760. J. Lee, Introd. Bot., I. xii. (1765), 28. Undulate, waved, as in Gloriosa.
1821. W. P. C. Barton, Flora N. Amer., I. 91. Leaves … entire, but undulate and irregular on the margin.
1870. Hooker, Stud. Flora, 305. Margins cartilaginous and undulate when dry.
b. Zool. 1826. Kirby & Sp., Entomol., IV. 290. Undulate,… when fasciæ, strigæ, lines, &c. curve into alternate sinuses resembling the rise and fall of waves. Ibid., 293. Undulate,… when the surface rises and falls obtusely, not in angles.
1846. Dana, Zooph. (1848), 167. Surface a little undulate.
