Meaning of LETHAL in English

LETHAL

le ‧ thal /ˈliːθ ə l/ BrE AmE adjective

[ Date: 1500-1600 ; Language: Latin ; Origin: lethalis , from lethum 'death' , from letum (influenced by Greek lethe ; ⇨ ↑ lethargic ) ]

1 . causing death, or able to cause death ⇨ fatal :

a lethal dose of heroin

a lethal weapon

death by lethal injection

a lethal cocktail of drink and pills

lethal to

These chemicals are lethal to fish.

2 . informal likely to be powerful or dangerous – often used humorously:

They were all drinking lethal amounts of tequila!

Higher taxes and higher inflation were a lethal combination.

Longman Dictionary of Contemporary English.      Longman - Словарь современного английского языка.