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meristem (n.)

"growing cellular tissues of plants, actively dividing cell tissue," 1862, formed irregularly from Greek meristos "divided, divisible" (verbal adjective from merizein "to divide, distribute," from meros "a part, a share;" from PIE root *(s)mer- (2) "to get a share of something") + ending from xylem, etc. Related: Meristematic.

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Definitions of meristem

meristem (n.)
undifferentiated tissue from which new cells are formed, as at the tip of a stem or root;
From wordnet.princeton.edu