Why was "tantrum" trending last week?
Plant tissue whose cells actively divide to form new tissues that cause the plant to grow. The originally undifferentiated cells of the meristem can produce specialized cells to form the tissues of roots, leaves, and other plant parts. The meristem includes the growing tips of roots and stems (the apical meristems) and the tissue layer known as cambium.
meristematic adjective (měr'ĭ-stə-māt'ĭk)