極きょく前ぜん線せん

noun

polar front

Meteorological term for the boundary between polar and tropical air masses.

• 極きょく前ぜん線せんは、寒かん帯たい気き団だんと熱ねっ帯たい気き団だんの境きょう界かいに形けい成せいされる。

  The polar front forms at the boundary between polar and tropical air masses.