15-letter words containing a, b, n, d, s
- unsubstantiated — not substantiated; unproved or unverified: unsubstantiated allegations.
- us savings bond — A US Savings bond is a long-term bond issued by the US government that is considered low-risk.
- vascular bundle — a longitudinal arrangement of strands of xylem and phloem, and sometimes cambium, that forms the fluid-conducting channels of vascular tissue in the rhizomes, stems, and leaf veins of vascular plants, the arrangement varying with the type of plant.