[f. prec. + -IST.] One who upholds the erosion theory in Geology.
1864. Reader, No. 94. 482/1. The erosionists allow the opportunities of ages to the causes of to-day.
1881. Geikie, in Macm. Mag., XLIV. 230/1. The Erosionists, or upholders of the efficacy of superficial waste.
