a. [f. L. ambulacr-um + -AL 1.] Of or pertaining to the ambulacra of Echinoderms; avenue-like.
1836–39. Sharpey, in Todd, Cycl. Anat. & Phys., II. 32/1. The ten ambulacral columns are disposed in five pairs. Ibid. (1847), III. 440/2. Hundreds of feet protrude through the ambulacral apertures.
1857. Wood, Com. Obj. Seashore, vii. 128. These are the ambulacral organs … but I prefer to call them feet. These feet are in fact suckers.
