Late Middle English; earliest use found in Guy de Chauliac's Grande Chirurgie. Partly from post-classical Latin pulverosus reduced to powder, dusty, partly from its elements classical Latin pulver-, pulvispulver + -ous.
Definition of pulverous in US English:
pulverous
adjectiveˈpʌlv(ə)rəs
Powdery; dusty.
Origin
Late Middle English; earliest use found in Guy de Chauliac's Grande Chirurgie. Partly from post-classical Latin pulverosus reduced to powder, dusty, partly from its elements classical Latin pulver-, pulvis pulver + -ous.