clutter

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A confused or disordered state or collection; a jumble.
• noun A confused noise; a clatter.
• intransitive verb To fill or spread over in a disorderly manner.
• intransitive verb To make disorderly or hard to use by filling or covering with objects.
• intransitive verb To run or move with bustle and confusion.
• intransitive verb To make a clatter.

from The Century Dictionary.

• To clot; coagulate.
• To become clotted or coagulated.
• noun A heap or collection of things lying in confusion; confusion; litter; disorder.
• To crowd together in disorder; fill with things in confusion: often with up: as, to clutter the things all together; to clutter up the house.
• To make a bustle or disturbance.
• To jumble words together in speaking, clipping syllables and dropping consonants.
• noun Confused noise; bustle; clatter; turmoil.

from the GNU version of the Collaborative International Dictionary of English.

• transitive verb obsolete To clot or coagulate, as blood.
• intransitive verb To make a confused noise; to bustle.
• noun A confused collection; hence, confusion; disorder.
• noun Clatter; confused noise.
• transitive verb To crowd together in disorder; to fill or cover with things in disorder; to throw into disorder; to disarrange.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun a confused disordered jumble of things
• noun background echos, from clouds etc, on a radar screen
• verb to fill something with clutter
• verb obsolete, intransitive To clot or coagulate, like blood.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun unwanted echoes that interfere with the observation of signals on a radar screen
• verb fill a space in a disorderly way
• noun a confused multitude of things