[epiph.y.sis] n, pl -y.ses [NL, fr. Gk, growth, fr. epiphyesthai to grow on, fr. epi- + phyesthai to grow, middle voice of phyein to bring forth--more at be] (1634) 1: a part or process of a bone that ossifies separately and later becomes ankylosed to the main part of the bone; esp: an end of a long bone
2: pineal gland