前ぜん縁えん

noun

leading edge (of a wing, propeller, etc.)

Technical term in aviation and aerodynamics for the front edge of an airfoil or propeller blade.

• 翼つばさの前ぜん縁えんに氷こおりが付ふ着ちゃくすると危き険けんです。

  It is dangerous when ice accumulates on the leading edge of the wing.

• プロペラの前ぜん縁えんは空くう気きを最さい初しょに切きる部ぶ分ぶんです。

  The leading edge of the propeller is the part that first cuts through the air.