The word 'voidings' is a noun that refers to the waste matter that is excreted from the body, such as urine and feces. Antonyms are words that have opposite meanings to another word. Therefore, antonyms for voidings could include words such as "intake," "consumption," "absorption," or "retention." These are all words that have to do with taking in and retaining nutrients or other substances instead of eliminating them. Other antonyms could include words such as "fullness," "completeness," or "satisfaction," which are all words that imply a state of being filled or satisfied rather than empty or eliminated.