hemistich (n.)youdaoicibaDictgodict[hemistich 词源字典]
"half a poetic line," 1570s, from Middle French hémistiche, from Latin hemistichium, from Greek hemistikhion "half-line, half-verse," from hemi- "half" (see hemi-) + stikhos "row, line of verse" (see stair).[hemistich etymology, hemistich origin, 英语词源]