noun Botany.
a body of cells formed on the periderm of a stem, appearing on the surface of the plant as a lens-shaped spot, and serving as a pore.

1850–55; < Neo-Latin lenticella, diminutive of Latin lenticula lentil; see lenticle

lenticellate [len-tuh-sel-it] , adjective
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World English Dictionary
lenticel (ˈlɛntɪˌsɛl)
any of numerous pores in the stem of a woody plant allowing exchange of gases between the plant and the exterior
[C19: from New Latin lenticella, from Latin lenticula diminutive of lēnslentil]

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American Heritage
Science Dictionary
lenticel   (lěn'tĭ-sěl')  Pronunciation Key 
One of the small areas on the surface of the stems and roots of woody plants that allow the interchange of gases between the metabolically active interior tissue and the surrounding air or pockets of air in the soil. Lenticels are portions of the periderm that have numerous pores or intercellular spaces. They appear as raised circular or elongated areas. The dark lines in birch bark and the tiny dots sometimes seen on skin of apples and pears are lenticels.
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