Definitions for "Annual ring"
The growth layer of I year, as viewed on the cross section of a stem, branch, or root. One year's growth consists of a layer of lighter-colored wood (springwood) and a layer of darker-colored wood (summerwood).
A layer of xylem and phloem produced during one season of growth.
The pattern created by one year's growth on a cross-section of a tree trunk, formed by the bands of springwood and summerwood.
Keywords:  botany