Dictionary.net

A group of plant cells that are capable of dividing infinitely and whose main function is the production of new growth at the growing tip of a root or stem. (From Concise Dictionary of Biology, 1990)

1. In botany, the new tissue at the sprouting end of a twig or growing leaf, consisting largely of actively dividing cells. Hence in histology - 2. Embryonal tissue.

Tissue formed of cells all capable of division, as found at growing points; merismatic or meristematic tissue.