meristem
Concise Oxford English Dictionary © 2008 Oxford University Press:
meristem /ˈmɛrɪstɛm/
▶noun Botany a region of plant tissue consisting of actively dividing cells.
– derivatives
meristematic /-stəˈmatɪk/ adjective.
meristematic /-stəˈmatɪk/ adjective.
– origin C19: from Gk meristos ‘divisible’ + -em on the pattern of xylem.
'meristem' also found in these Oxford entries:

