Entry 1 sense Webster, 1913 Notorhizal /(nō`tō̇*rī"zal)/ · No·to·rhi·zal · IPA 01 a. Having the radicle of the embryo lying against the back of one of the cotyledons; incumbent. 1. Having the radicle of the embryo lying against the back of one of the cotyledons; incumbent.(Bot.)