latewood

/ˈleɪtˌwʊd/
noun
  1. The dense, dark part of a tree's annual growth ring that forms later in the growing season, typically in summer.
    • The latewood in this oak plank is much darker than the earlywood.
    • Woodworkers often prefer the strength of latewood for fine furniture.
    • Under a microscope, you can see the difference between earlywood and latewood.
Antonyms