"contaminating" in the verb sense
1. pollute, foul, contaminate
make impure
"The industrial wastes polluted the lake"
2. contaminate
make radioactive by adding radioactive material
"Don't drink the water
"contaminating" in the adjective sense
1. dirty, contaminating
spreading pollution or contamination especially radioactive contamination
"the air near the foundry was always dirty"
"a dirty bomb releases enormous amounts of long-lived radioactive fallout"
2. corrupting, contaminating
that infects or taints
Source: WordNet® (An amazing lexical database of English)
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