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The Collaborative International Dictionary of English v.0.48 (gcide)

contaminated \contaminated\ adj.
1. containing undesired or infective microorganisms.

Syn: dirty, infected.
[WordNet 1.5]

2. rendered impure by addition of deleterious substances; as,
had to boil the contaminated water.

Syn: polluted.
[WordNet 1.5]

3. 1 (Computers) damaged by inclusion of incorrect data or
information not belonging; as, The file was contaminated
by a buggy editor.

Syn: corrupted.
[PJC]

4. appearing unethical due to a questionable source or
motives; -- of money or activities; as, The fund was
contaminated by a large donation from a mobster.

Syn: tainted.
[PJC]


Contaminate \Con*tam"i*nate\ (k[o^]n*t[a^]m"[i^]*n[=a]t), v. t.
[imp. & p. p. {Contaminated}; p. pr. & vb. n.
{Contaminating}.] [L. contaminatus, p. p. of contaminare to
bring into contact, to contaminate, fr. contamen contagion,
for contagmen; con- root of tangere to touch. See
{Contact}.]
To soil, stain, or corrupt by contact; to tarnish; to sully;
to taint; to pollute; to defile.
[1913 Webster]

Shall we now
Contaminate our figures with base bribes? --Shak.
[1913 Webster]

I would neither have simplicity imposed upon, nor
virtue contaminated. --Goldsmith.

Syn: To pollute; defile; sully; taint; tarnish; soil; stain;
corrupt.
[1913 Webster]