cotyˈledonal,a.rare. [f.prec. + -al1 (less according to L. analogy than -ar).] = cotyledonary. 1850Owen in Life A. Sedgwick II. 193 It reminds me of the germ of a goodly tree between two fat cotyledonal leaves.1875― in Blake Zool.Pref. xii, Annular, discoid, cotyledonal, and diffused placentæ.