A portion of secondary vascular tissue (PO:0025409) that has as part ray wood parenchyma (PO:0004534) and extends radially in the secondary xylem (PO:0005848) and secondary phloem (PO:0005848) of a plant axis (PO:0025004). [source: ISBN:0471245208]
Comment
May include ray tracheids, as in Pinaceae and some Cupressaceae.