noun
triaxial compression apparatus
Specialized geotechnical engineering device used to measure soil or rock strength under controlled stress conditions.
三軸圧縮試験機を用いて土のせん断強度を測定した。
We measured the shear strength of the soil using a triaxial compression apparatus.
Compound of 三軸 (triaxial) + 圧縮 (compression) + 試験機 (testing machine). A straightforward technical term with no historical ambiguity.