Webster's English Dictionary

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meristem

mer.i.stem \'mer-*-.stem\ \.mer-*-st*-'mat-ik\ \-i-k(*-)le-\ n [Gk meristos 
   divided (fr. merizein to divide fr. meros) + E (X-em (as in system) : a 
   formative plant tissue usu. made up of small cells capable of dividing  
   indefinitely and giving rise to similar cells or to cells that 
   differentiate to produce the definitive tissues and organs - 
   mer.i.ste.mat.ic aj