Definition of meristem in English:

meristem

noun

Botany
  • A region of plant tissue, found chiefly at the growing tips of roots and shoots and in the cambium, consisting of actively dividing cells forming new tissue:

    ‘the apical meristem of the shoot produces the embryonic seed leaves’
    • ‘This condition can also be due to restricted diffusion of oxygen into internal tissues or high rates of cellular metabolism, as in actively dividing cells of meristems.’
    • ‘The developmentally accumulated proteins localized to early differentiating, but not the highly dividing, regions of the root and shoot apical meristems.’
    • ‘Leaves communicate photoperiodic signals to meristems, stolons and buds in flowering, tuberization and dormancy.’
    • ‘These embryos had organized root meristems and apical shoot meristems flanked by the developing cotyledons.’
    • ‘Plant growth originates from meristems, localized tissues with stem cell features that are at the origin of all organs of the plant.’

Origin

Late 19th century: formed irregularly from Greek meristos divisible, from merizein divide into parts, from meros part. The suffix -em is on the pattern of words such as xylem.

Pronunciation:

meristem

/ˈmɛrɪstɛm/