perithecium

[Greek perithēkē a lid, a cover.] Botany : (1) The part of a lichen in which the asci are immersed. (2) The part which contains the reproductive organs of Sphæria and its allied fungals; the small, flat receptacles in which asci are formed in the Pyrenomycetous fungals. *pěr-i-tion, s. [PERISH.] Perishing, annihilation. ( Bp . Hall: Works, vi. 411.) pě-rít-o-mous, a. [Gr. per i tomos cut off all piece cut off.] peristaltic-motion, s. act or state of perishing.