Merriam-Webster's Collegiate® Dictionary, 11th Edition
CLUTTER
I. verb
Etymology: Middle English clotteren to clot, from clot
Date: 1556
intransitive verb to run in disorder, transitive verb to fill or cover with scattered or disordered things that impede movement or reduce effectiveness ,
II. noun
Date: 1649
1. a crowded or confused mass or collection, things that clutter a place, interfering radar echoes caused by reflection from objects (as on the ground) other than the target, disturbance , hubbub