Definition of perturbant in US English:

perturbant

noun

  • A perturbing agent. rare.

Origin

Late 19th century; earliest use found in Alfred Newton (1829–1907), zoologist. From classical Latin perturbant-, perturbāns, present participle of perturbāre; compare -ant.

Pronunciation

perturbant

/pəˈtəːb(ə)nt/