node
noun [ C ] specialized uk/nəʊd/ us/noʊd/
(LUMP)
medical （生物体的）节，结，瘤
a lump (= raised area) or swelling on or in a living object
a lymph node 淋巴结
(JOIN)
mathematics, computing, biology （线等的）交点;（植物的）茎节
a place where things such as lines join, or where a leaf and stem join on a plant
a leaf node 叶节点