growth ring

This term is primarily used in botany and dendrochronology. It describes the physical manifestation of a tree's seasonal growth cycle, where the difference in cell size between earlywood and latewood creates a visible boundary. These rings serve as a biological archive, recording climatic conditions and environmental stress over decades or centuries.

In a technical context, the term is often used interchangeably with annual ring, though growth rings can occasionally occur more than once a year in specific climates or due to extreme weather events, making the distinction important for precise scientific dating.