baselayer
nounUK /ˈbeɪsˌleɪ.ər/
US /ˈbeɪsˌleɪ.ɚ/
A baselayer is the first piece of clothing you put on your body to keep warm or dry.
She wore a warm baselayer under her jacket before going skiing.
OTHER MEANINGS
2. A thin layer of paint or material applied first to a surface.
The painter spread a baselayer on the wall before adding color.
3. The lowest layer in a computer or software system that supports the rest.
The baselayer of the app handles all the basic connections.
4. A foundational layer in a model or design that other parts build on.
The baselayer of the map shows the roads and rivers.