同どう圧あつ線せん

noun

isobar; isopiestic line

Technical term in meteorology and physics for a line connecting points of equal pressure.

• 天てん気き図ずの同どう圧あつ線せんが混こんでいる所ところは風かぜが強つよい。

  Where isobars are close together on a weather map, the wind is strong.