Final answer:
The prefix peri- means beside or near.
Step-by-step explanation:
The prefix peri- means beside or near. It is derived from the Greek word peri which also means 'around' or 'about'. This prefix is commonly used in English to create words that describe something that is located or situated near or around a particular object or area.
For example, in the word perimeter, the prefix peri- is used to indicate the boundary or the area surrounding a shape or object. Another example is periscope, where the prefix peri- is used to describe a viewing device that allows you to see around or over an obstacle.
In conclusion, the prefix peri- in English words signifies a concept of being 'beside' or 'near'.