cotidal

co.tid.al

adj.（形容词）
Indicating coincidence of high tides or low tides.
表示低潮与高潮同时的
Of or relating to a line that passes through each location on a coastal map where tides occur at the same time of day.
同潮线的：沿岸地图上穿过一天中同时有潮经过的地点的连线的，或与等潮线有关的