median
adj.
1590s, from Middle French médian (15c.) and directly from Latin medianus "of the middle," from medius "in the middle" (see medial, adj.). Originally anatomical, of veins, arteries, nerves. Median strip "strip between lanes of traffic" is from 1954.
n.
"a median part," 1540s, from Latin medianus (see median, adj.). Meaning "middle number of a series" is from 1883.
〔蒋〕[medi中间，-an形容词后缀，…的] 当中的，中央的;[转为名词] 中部，当中
〔李〕[medi=middle中间；-an a.=belonging to属于……的→“belonging to the middle属于中间位置的”→] a. in the middle;running through themiddle 当中的；穿过当中的