Definition:
A lenticel is an opening that allows gases to be exchanged between air and the inner tissues of a plant. Lenticels can be commonly found in bark and on the outside of fruits.
The name lenticel comes from the fact that it is lens shaped. Lenticels are one way that you can identify a tree since the size and shape varies from tree to tree.
You can see the lenticels on this birch tree. They are those horizontal lines across the bark.
Pronunciation: len-tuh-sel
