noun
harmfulness; toxicity
Refers to the property of being harmful or toxic, often used in scientific, medical, or regulatory contexts.
この化学物質の有害性はまだ十分に調査されていない。
The harmfulness of this chemical substance has not yet been fully investigated.
製品
It is necessary to assess the toxicity of the product.
毒性 specifically means 'toxicity' (poisonous nature), while 有害性 is broader and includes general harmfulness.
Compound of 有害 (harmful) + 性 (-ness, property).