A more thorough explanation:

VASTUM

vastum (vas-təm), n. Hist. WASTE. vastum forestae vel bosci (vas-təm for-es-tee vel bahs-I). Hist. Waste of a forest or wood.

Vastum is a Latin term that means "waste." In historical context, it refers to the waste of a forest or wood. For example, if a forest was destroyed by fire or deforestation, it would be considered a vastum forestae vel bosci.

• After the wildfire, the once lush forest was now a vastum.
• The deforestation of the Amazon rainforest has resulted in vastums across the region.

These examples illustrate how the term vastum can be used to describe the waste of a forest or wood due to natural or human causes.