noun
bilateral asymmetry; left-right asymmetry
Technical term used in biology, anatomy, engineering, and design to describe a lack of symmetry between the left and right sides.
この生物は左右非対称の体を持っている。
This organism has a bilaterally asymmetrical body.
左右非対称なデザインが特徴的だ。
The design is characterized by left-right asymmetry.
Compound of 左右 (left and right) + 非対称 (asymmetry). The exact historical derivation is uncertain, but the term is a straightforward modern technical coinage.