impellent

adj, noun — 2 senses

adj

/ɪmˈpɛlənt/

Having the quality of being impelling.

an impellent force
Hence, the excess of impellent force which was given to the piston, beyond what was absolutely requisite to overcome the resistances to its motion, was made available to prolong that motion, beyond the point at which the impellent force […]1827, John Farey, A Treatise on the Steam Engine Historical, Practical, and Descriptive, page 181:

noun

An impelling power or force.

blind impellents and material conveyances1665, Joseph Glanvill, Scepsis Scientifica: Or, Confest Ignorance, the Way to Science; […], London: […] E. C[otes] for Henry Eversden […], →OCLC:

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.