skeletal element
endochondral element
https://github.com/obophenotype/uberon/wiki/Modeling-endochondral-elements-Design-Pattern
uberon
A skeletal element that has the potential to participate in endochondral ossification, and may participate in intramembranous ossification.
VSAO:0000139
UBERON:0010363
endochondral replacement element
ZFA:0005620
XAO:0004017