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