noun
semicircular canal
Anatomical term for the three fluid-filled canals in the inner ear that help maintain balance. Often used in the compound 三半規管 (さんはんきかん).
See also: 三半規管
半規管は平衡感覚に関係している。
The semicircular canals are involved in the sense of balance.
三半規管が弱い
People with weak semicircular canals are prone to motion sickness.
From 半 (half) + 規 (compass, rule) + 管 (tube, duct), describing the half-circle shape of the canals.