isochron
/ˈaɪsəʊkrɒn/noun
- chiefly Geology a line on a diagram or map connecting points relating to the same time or equal times【主地质】等时线。
词源
late 17th cent. （as an adjective in the sense 'isochronous'）： from Greek isokhronos, from isos 'equal' + khronos 'time'.