denudant
(dɪˈnjuːdənt)
[f. denude v. + -ant1.]
That which denudes; spec. in Geol., an agent or agency which removes disintegrated matter and lays bare the underlying rock or formation.
| 1894 J. Geikie Gt. Ice Age (ed. 3) 259 Its [sc. the boulder-clay's] chief denudant has evidently been running water. |