From Wiktionary, the free dictionary
From sacro- + costal.
sacrocostal (not comparable)
- (anatomy) Relating to the sacrum and the ribs
2015 December 17, “A New Sail-Backed Styracosternan (Dinosauria: Ornithopoda) from the Early Cretaceous of Morella, Spain”, in PLOS ONE[1], →DOI:The distal end of the sacrodorsal rib is fused to the sacrocostal yoke.