Definition of mesothecium in English:

mesothecium

noun

Botany
rare
  • A layer in the outer wall of the pollen sac of a young anther, between the endothecium and the tapetum.

Origin

Late 19th century. From meso- + -thecium.

Pronunciation

mesothecium

/ˌmɛsə(ʊ)ˈθiːsɪəm/