"Cryogenic particle" refers to small particulate matter that has been subjected to extremely low temperatures to achieve certain properties or behaviors. When searching for synonyms for this term, one might consider words or phrases that capture the idea of extreme cold, such as "frozen particles" or "ultra-cold matter." Related terms might include "cryogenic fluid" or "cryogenically treated material," which refer to substances that have been manipulated in a similar manner. Additionally, words like "sub-zero particles" or "cryonic matter" could be used to further describe these unique materials. Overall, these various synonyms serve to capture the essence of materials that have been modified through the application of extreme cold.