1 [U] the quality of being poisonous; the degree to which sth is poisonous 毒性；毒力: substances with high/low levels of toxicity 毒性很大╱小的物质

2 [C] the effect that a poisonous substance has 毒效: Minor toxicities of this drug include nausea and vomiting. 这种药物轻度中毒的症状包括恶心及呕吐。