Definition of lethal
- death by lethal injection
- lethal chemicals
- a lethal attack on his reputation
- a lethal fastball
- a lethal rum punch
a potentially lethal dose of a drug
He was sentenced to death by lethal injection.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'lethal.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
: causing or able to cause death
What made you want to look up lethal? Please tell us where you read or heard it (including the quote, if possible).