Pleuron is the term given to the lateral plate present on the thorax of arthropods. It is an anatomical term frequently used in entomology and zoology to describe structures located on the side of an animal's body. The synonyms for pleuron include the term coxa in the context of the joint connecting an insect's legs to its thorax. Another synonym for pleuron is lateral plate or lateral sclerite, which refers to the hardened outer shell made of chitin-sclerotized cuticle. In some cases, pleuron is alternatively referred to as pleural sclerite or pleural wing and pleural arch, depending on specific animal groups. It is essential to have knowledge of these synonyms to understand the anatomy of arthropods.