D defs.my
Entry 1 sense Webster, 1913

Clumper

· Clump·er · IPA /ˈklʌmpɚ/
01 v. t. To form into clumps or masses.
  1. 1.
    To form into clumps or masses.[Obs.]
    “Vapors . . . clumpered in balls of clouds.” Dr. H. More.