lineal
/ˈlɪnɪəl/adjective
1
- in a direct line of descent or ancestry直系的：
a lineal descendant.
直系后代。
2
- of, relating to, or consisting of lines; linear（与）线（有关）的, 由线组成的; 线性的。
派生词
lineally
adverb词源
late Middle English: via Old French from late Latin linealis, from linea 'a line' （see LINE1）.