Technical term for the resistance of a fluid to flow; used in physics, engineering, and everyday descriptions of liquids.
この液体は粘度が高いので、注ぐのに時間がかかる。
This liquid has high viscosity, so it takes time to pour.
viscometer; viscosimeter
Compound of 粘 (nen, 'sticky') and 度 (do, 'degree'), literally 'degree of stickiness'. A modern technical coinage.