Could you please provide more context or information about where you encountered this term?
For example:
* The word you saw it in: "What does the suffix 'paenia' mean in the word 'somethingpaenia'?"
* The language: "Is this a suffix in English, Latin, or another language?"
* The subject: "Was this term related to a specific field like medicine, biology, or literature?"
Knowing this information will help me give you a more accurate answer.