eustele definition
Definition of 'eustele'. eustele (ËjuËËstiËl) noun. botany. a type of stele found in most seed plants, consisting of a central pith surrounded by the primary vascular tissue. eustele in American English (Ëjustil ; yoÌoËstÄl; juËstili ; yoÌostÄËlÄ) noun. the typical vascular cylinder of a dicotyledonous plant or a gymnosperm, consisting of a ring of collateral bundles of xylem, cambium, and phloem.