metaphysis

English Thesaurus

1. the growing part of a long bone between the diaphysis and the epiphysis (noun.body)

hypernym	:	appendage, outgrowth, process,
definition	:	a natural prolongation or projection from a part of an organism either animal or plant (noun.body)

part meronym	:	long bone, os longum,
definition	:	in limbs of vertebrate animals: a long cylindrical bone that contains marrow (noun.body)