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%ما هو (من)٪ 1 - تعريف
IN BOTANY, A LOOSELY-PACKED MASS OF OFTEN MORE OR LESS ROUNDED CORK CELLS OCCURRING ESPECIALLY IN THE YOUNG STEM, BARK OR EVEN LEAF OF A PLANT, VISIBLE ON THE SURFACE AS A RAISED, OFTEN POWDERY-APPEARING SPOT, THROUGH WHICH GASEOUS EXCHANGE OCCURS
Lenticels; Lenticles; Lenticellate; Lenticelled
![Lenticels on ''[[Prunus serrula]]''](https://commons.wikimedia.org/wiki/Special:FilePath/Prunus serrula bark lenticels, Dawyck Botanic Gardens.JPG?width=200 "Lenticels on ''[[Prunus serrula]]''")
![Alder bark (''[[Alnus glutinosa]]'') with characteristic lenticels and abnormal lenticels on callused areas](https://commons.wikimedia.org/wiki/Special:FilePath/Alder bark and callus.JPG?width=200 "Alder bark (''[[Alnus glutinosa]]'') with characteristic lenticels and abnormal lenticels on callused areas")
![Lenticels on [[potato]]es of the Monalisa variety](https://commons.wikimedia.org/wiki/Special:FilePath/Pommes de terre Monalisa.png?width=200 "Lenticels on [[potato]]es of the Monalisa variety")
![Lenticels on [[Williams pear]] varieties](https://commons.wikimedia.org/wiki/Special:FilePath/Poires williams Vertes et Rouges Savoie.jpg?width=200 "Lenticels on [[Williams pear]] varieties")
Lenticel
·noun A small, lens-shaped gland on the under side of some leaves.
II. Lenticel ·noun One of the small, oval, rounded spots upon the stem or branch of a plant, from which the underlying tissues may protrude or roots may issue, either in the air, or more commonly when the stem or branch is covered with water or earth.
lenticel
['l?nt?s?l]
¦ noun Botany one of many raised pores in the stem of a woody plant allowing gas exchange between the atmosphere and the internal tissues.
Origin
C19: from mod. L. lenticella, dimin. of L. lens, lent- 'lentil'.
Lenticellate
·adj Producing lenticels; dotted with lenticels.
ويكيبيديا
Lenticel
A lenticel is a porous tissue consisting of cells with large intercellular spaces in the periderm of the secondarily thickened organs and the bark of woody stems and roots of gymnsperms and dicotyledonous flowering plants. It functions as a pore, providing a pathway for the direct exchange of gases between the internal tissues and atmosphere through the bark, which is otherwise impermeable to gases. The name lenticel, pronounced with an [s], derives from its lenticular (lens-like) shape. The shape of lenticels is one of the characteristics used for tree identification.
