Dendrochronology meaning is?

Have you ever seen a tree stump from a fallen/cut down tree? If you look at it, you can see that the trunk has rings. The number of rings on the tree tells you how old that tree is. Pretty neat, huh?

Dendrochronology is, essentially, a scientific method or way of dating (telling how old) things in the environment. You use this field of study to determine the age of living things, changes in the environment, and growth patterns.

the science of dating events and variations in environment in former periods by comparative study of growth rings in trees and aged wood