noun
viscous fluid
Technical term in physics and fluid mechanics for a fluid with significant viscosity.
粘性流体の流れを解析するには、ナビエ・ストークス方程式が必要だ。
To analyze the flow of a viscous fluid, the Navier-Stokes equations are necessary.
Compound of 粘性 (viscosity) + 流体 (fluid). A straightforward technical term.