perithecium
noun
peri·the·ci·um ˌper-ə-ˈthē-shē-əm 
-sē-
plural perithecia ˌper-ə-ˈthē-shē-ə
-sē-
: a spherical, cylindrical, or flask-shaped hollow fruiting body in various ascomycetous fungi that contains the asci and usually opens by a terminal pore
perithecial
ˌper-ə-ˈthē-sh(ē-)əl
adjective -sē-əl
Word History
Etymology
New Latin, from peri- + Greek thēkion, diminutive of thēkē case — more at tick
First Known Use
1800, in the meaning defined above
Medical Definition
perithecium
noun
peri·the·ci·um -ˈthē-sē-əm
plural perithecia -sē-ə
: a spherical, cylindrical, or flask-shaped hollow fruiting body in various ascomycetous fungi that contains the asci, usually opens by a terminal pore, and sometimes includes the cleistothecium