1580s, from Late Latin lethalis, alteration of Latin letalis "deadly, fatal," from letum "death," of uncertain origin. Form altered in Late Latin by association with lethes hydor "water of oblivion" in Hades in Greek mythology, from Greek lethe "forgetfulness."
例文
1. The barriers are lethal to fish trying to swim upstream.
これらの障害物は、上流に泳ぎたい魚にとって致命的である。
2.Execution by lethal injection is scheduled for July 30 th.
7月30日に注射死刑を執行する予定です。/
3.High-powered cars are lethal weapons in the hands of inexperienced drivers.
馬力の強い車は経験のない運転手の手に渡ると壊滅的な武器になる。
4.Someone had fed hima lethal dose of cyanide.
致命的な量のシアン化物を投与された人がいる。
5.They were close to weaponizing ricin-a lethal plant toxin.