Peritrichous is defined as having cilia or flagella distributed over the entire surface of a cell or organism. Some synonyms of peritrichous are flagellated, whiplike, motile, and swimming. Other options include motile, moving, mobile, and traveling. Additionally, words like flail, oscillating, rotating, and spiraling can also be used to describe peritrichous organisms. Organisms that are peritrichous include various species of bacteria, protozoa, and algae. These synonyms can be used interchangeably depending on the context of the sentence, but all of them describe the presence of flagella or cilia on the surface of cells or organisms.