stoma

• اسم يشير إلى فتحة أو ثقب صغير، مثل الثغور المجهرية في بشرة الأوراق والسيقان التي تتم بها تبادل الغازات، أو فتحة تُنشأ جراحياً على سطح الجسم تتصل بعضو داخلي.

A noun referring to a small opening or pore, such as the minute epidermal pores in leaves and stems that allow gas exchange, or a surgically created opening on the body surface connecting to an internal organ.

1. Plant poreB2formalscientific

   A minute epidermal pore in a leaf or stem through which gases and water vapor can pass.

   ثغر

   • Stomata regulate the exchange of carbon dioxide and oxygen in plants.
   • The leaf's stoma opens during the day to allow gas exchange.
   • Water vapor escapes through the stoma in a process called transpiration.

2. Surgical openingB2formalmedical

   A mouth or mouthlike opening created by surgery on the surface of the body to connect an internal organ to the outside.

   فُغْرَة

   • The patient had a colostomy stoma after the operation.
   • Nurses taught him how to care for his new stoma.
   • The stoma allows waste to exit the body into a collection bag.

   المرادفاتostomy