Dusted or covered with or as if with powder.(adjective)
Easily made into powder; friable.(adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "powdery" in a sentence
"Got some snow, I'm trying to pack a good snow ball here, but you know, I think this is what they call the powdery snow, the kind that skiers like."
"The screen dissolves to a shot of Hitler on a podium as a battalion of men, glinting spades on their shoulders, march past in powdery sunlight."
"An exception is a fungal disease called powdery mildew, which thrives in dry conditions."