Definitions for "Meristem"
A tissue of growing cells, or cells capable of further division.
Any growing point of both root and stem on a plant, where active cell division is taking place. There are both apical and axillary meristems.
Technically, the actively dividing cell tissue taken from root tips and from the tips of new growths or floral shoots; sometimes loosely used to refer to the mericlone plant that is produced from the laboratory propagation of meristem tissue.