1Waste, especially industrial waste, that is hazardous to human health or the environment and which requires special facilities for its disposal; also occasionally as a count noun.
2Finance informal extremely risky or poorly rated securities.
Origin
1920s.
Definition of toxic waste in US English:
toxic waste
noun
1Waste, especially industrial waste, that is hazardous to human health or the environment and which requires special facilities for its disposal; also occasionally as a count noun.
2Finance informal extremely risky or poorly rated securities.