pəˈrifəsə̇s noun
( plural periphy·ses -əˌsēz)
Etymology: New Latin, from Greek, overgrowth, from periphyein to grow around, grow over (from peri- + phyein to grow, bring forth) + -sis — more at be
: one of the sterile filaments that line the ostiole of many perithecia and other fruiting structures — compare paraphysis