theca

• اسم يدل على غلاف أو وعاء أو بنية محيطة تحوي شيئًا، مثل الكيس الطلعي أو علبة الطحلب في علم النبات، أو الغلاف الخارجي للخادرة عند بعض الحشرات.

A noun referring to a case, sheath, or enclosing structure, such as a pollen sac or moss capsule in botany, or the outer sheath of the pupa in certain insects.

1. Botanical structureC2formalscientific

   A case or sheath, especially a pollen sac in flowering plants or a capsule in mosses.

   الكيس النباتي

   • The theca of the moss capsule splits open to release spores.
   • Each anther contains two thecae that hold pollen grains.
   • Botanists studied the theca structure under a microscope.

   المرادفاتcapsulecasesacsheathsporangium

2. Insect pupal sheathC2formalscientific

   The outer protective sheath covering the pupa of certain insects.

   غلاف العذراء

   • The insect's theca hardened to protect the developing pupa.
   • Entomologists observed the theca of the butterfly pupa.
   • The theca splits open when the adult insect emerges.