The Collaborative International Dictionary of English v.0.48:

Epiphysis \E*piph"y*sis\, n.; pl. Epiphyses. [NL., fr. Gr.
   'epi`fysis, fr. 'epify`ein to grow upon; 'epi` upon + fy`ein
   to grow.] (Anat.)
   (a) The end, or other superficial part, of a bone, which
       ossifies separately from the central portion, or
       diaphysis.
   (b) The cerebral epiphysis, or pineal gland. See Pineal
       gland, under Pineal.
       [1913 Webster]