厚あつみ方ほう向こう

noun, adverb

thickness direction; perpendicular direction; lengthwise direction

Technical term used in engineering, materials science, and manufacturing to refer to the direction along the thickness of an object, often perpendicular to the main surface. Can also refer to the lengthwise direction in some contexts, such as when describing the orientation of fibers or layers.

• この材ざい料りょうは厚あつみ方ほう向こうに圧あっ縮しゅくすると強きょう度どが増ます。

  This material gains strength when compressed in the thickness direction.