What's the plural form of lethal injection? Here's the word you're looking for.
Answer
The noun lethal injection can be countable or uncountable.
In more general, commonly used, contexts, the plural form will also be lethal injection.
However, in more specific contexts, the plural form can also be lethal injections e.g. in reference to various types of lethal injections
or a collection of lethal injections.
