camouflage

Short definition from Wiktionary

Noun

1. 1
   A disguise or covering up.
2. 2
   The act of disguising.
3. 3
   The use of natural or artificial material on personnel, objects, or tactical positions with the aim of confusing, misleading, or evading the enemy.
4. 4
   A pattern on clothing consisting of irregularly shaped patches that are either greenish/brownish, brownish/whitish, or bluish/whitish, as used by ground combat forces.
5. 5
   The resemblance of an organism to its surroundings for avoiding detection.
6. 6
   Clothes made from camouflage fabric, for concealment in combat or hunting.

Verb

1. 1
   To hide or disguise something by covering it up or changing its appearance.