nounWord forms:  plural -ses (-ˌsiːz)1. the end of a long bone, initially separated from the shaft (diaphysis) by a section of cartilage that eventually ossifies so that the two portions fuse together
 2.  Also called: epiphysis cerebri (ˈsɛrɪˌbraɪ).  the technical name for pineal gland 
 Word origin
C17: via New Latin from Greek: a growth upon, from 
epi- + 
phusis growth, from 
phuein to bring forth, produce