dīˈafəsə̇s noun
( plural diaphy·ses -əˌsēz)
Etymology: New Latin, from Greek, ridge on the shaft of the tibia, from diaphyesthai to grow between, be connected with (from dia- + phyesthai, mid. of phyein to bring forth) + -sis — more at be
: the shaft of a long bone — distinguished from epiphysis