The word "pleurotribe" (PLEW-roh-tryb) is a combination of two Greek roots: "pleura," meaning "rib" or "side," and "tribos," meaning "rubbing." Together, they form a word that refers to the rubbing or chafing of the ribs against each other. The tricky spelling may also be due to the "eu" diphthong, which is pronounced like "yoo." Despite its challenging spelling, understanding the pronunciation and meaning of "pleurotribe" can broaden one's knowledge of anatomy and physiology.