Pteroid is an uncommon word used to describe anything that resembles a wing or fin. Synonyms for pteroid include wing-like, fin-like, and aerodynamic. Other alternatives include featherless, gliding, soaring, and fluttering. In the context of biology, pteroid is commonly associated with the pterosaur, a group of extinct flying reptiles that were similar in appearance to modern-day bats. Some additional synonyms that pertain to pterosaurs include flying, prehistoric, and reptilian. Regardless of the context, the use of synonyms can help to expand one's vocabulary and improve their communication skills.