fluxion

• 名词，指流动、流出或物质与能量的排出；在数学史上指牛顿使用的流数（微积分中的导数）。

A noun referring to a flow or discharge of a substance or energy.

1. Flow or dischargeC1formalmedical

   A flowing or discharge of a substance, especially from the body.

   流出

   • The doctor observed a fluxion of fluid from the wound.
   • He suffered from a constant fluxion of nasal mucus during allergy season.
   • The medical report noted a fluxion in the lymphatic system.

   同义词dischargeeffusionemissionflowfluxissueoutflowsecretion

2. Rate of change (calculus)C2formalscientific

   In Newtonian calculus, the instantaneous rate of change of a flowing quantity; a derivative.

   流数

   • Newton introduced the concept of fluxion to describe velocity.
   • The fluxion of a curve at a point gives its slope.
   • In modern terms, fluxion corresponds to the derivative.

   同义词derivativedifferential coefficient