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