lenticel
Concise Oxford English Dictionary © 2008 Oxford University Press:
lenticel /ˈlɛntɪsɛl/
▶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’.
'lenticel' also found in these Oxford entries:

