apical meristem; promeristem
Botanical term for the growing tip of a plant shoot or root. 'Promeristem' is a less common synonym.
The apical meristem is located at the tip of the stem or root.
Compound of 頂端 (chōtan, 'apex') + 分裂組織 (bunretsu soshiki, 'meristem'). A modern scientific term.