Word: Sapwood
Definition:
Sapwood is the newly formed outer layer of wood in a tree or woody plant. It lies between the cambium (a thin layer of growing tissue) and the heartwood (the older, inner part of the wood). Sapwood is usually lighter in color than heartwood and is important because it helps transport water and nutrients throughout the tree.
In forestry and woodworking, understanding the difference between sapwood and heartwood is important for determining the strength and durability of wood. Sapwood is often less resistant to decay than heartwood.
While "sapwood" primarily refers to the wood in trees, in a metaphorical sense, it can describe something that is newer or less mature compared to the established or older parts of something.
There are no specific idioms or phrasal verbs directly related to "sapwood." However, you might encounter phrases like "getting to the root of the problem," which uses "root" to metaphorically refer to foundational issues, similar to how sapwood is foundational for a tree's health.
In summary, sapwood is the important, lighter-colored outer layer of wood in trees that helps with water transport. It's useful in woodworking and understanding tree biology.