Prolonged exposure to the chemical compound proved deleterious to the aquatic ecosystem, reducing fish populations and altering water quality.
长期接触该化合物对水生生态系统有害，导致鱼类数量减少并改变水质。
Which choice best defines “deleterious”?
D — Harmful to health or well-being.. “deleterious” means Harmful to health or well-being..
Which word means “Harmful to health or well-being.”?
B — deleterious. “deleterious” means Harmful to health or well-being..
deleterious — Harmful to health or well-being.. In Chinese: 有害的；有毒的.
deleterious is pronounced //ˌdɛlɪˈtɪəriəs//.
Prolonged exposure to the chemical compound proved deleterious to the aquatic ecosystem, reducing fish populations and altering water quality. (长期接触该化合物对水生生态系统有害，导致鱼类数量减少并改变水质。)
harmful, damaging, detrimental — all close in meaning to deleterious (Harmful to health or well-being.).
beneficial, harmless — each the opposite of deleterious (Harmful to health or well-being.).
Yes. deleterious is on the SAT Prep Difficult list — the higher-register words that decide the hard questions. The Digital SAT does not test vocabulary in isolation; words like this one are tested through Words in Context questions, where you choose the word that completes a passage most logically and precisely.
delet(毁) → 损害健康。