neotenic

"Neotenic" is a biology word first, even though it now appears in wider cultural writing as well. At its core, it describes an adult organism that retains traits normally seen in a younger stage of development. In other words, the body keeps some juvenile features instead of fully moving away from them during growth. The idea is linked to slowed or altered development, especially when compared with related species or with the usual path from young form to adult form.

A well-known example is the axolotl. This salamander can become sexually mature while still keeping larval features such as external gills and an aquatic lifestyle. That makes it one of the clearest examples of neoteny in biology. Humans are also often discussed in neotenic terms when compared with other primates. Writers point to traits such as a flatter face, less body hair, and a long period of learning and dependence as signs that some juvenile primate traits remain present in adult humans.

Outside biology, "neotenic" is often used in a looser, metaphorical way. A writer might use it for a face with baby-like proportions, for character art with oversized eyes, or for a style that leans into softness and innocence. In these cases, the meaning is not technical. It simply suggests that something has the look, feel, or emotional effect of youth.

In serious scientific use, the word is most at home in discussions of development and evolution. In broader everyday writing, it keeps the same core idea but in a softer way: adulthood carrying something youthful forward. Whether you are reading about salamanders, human evolution, or visual design, "neotenic" points to the persistence of youthful traits where you might expect full adult development.