Peri- is a prefix that is used in various words to describe something that is located near, around, or surrounding a particular thing or person. There are several synonyms for the prefix peri- that can be used in different contexts. Some of the common synonyms for peri- include circum-, which means around, encircling, or encompassing; para-, which means beside, along with, and adjacent to; and ambient, which means surrounding or encompassing. Other synonyms that can be used interchangeably with peri- include ambient, circumferential, peripheral, and proximal. These synonyms can be used to modify a wide range of words, including medical terms, anatomical structures, and natural phenomena.