An implement of stone or other hard substance used as a pestle to grind paints or drugs.(noun)
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 "muller" in a sentence
"Use a muller, which is a glass or stone grinding device, to spread the paint into a thin layer on the glass or marble; more pigment or more oil may be added, depending upon whether the paint is too runny or too thick."
"I might stay up to watch Pacquiao muller Ortiz in five rounds, but Mayweather is not the guy to watch when you're already sleepy, prodigiously talented though he most certainly is."
"Lineker, me and Hansen, three tarts together, he'd muller all of us."