Gerund functioning as an uncountable or occasionally countable noun.
Definitions
The act or process of spreading over or covering something completely. The rapid overspreading of lava formed a new crust on the island.
overspreadgerund / present participle Used attributively to describe something that is in the act of spreading over something else.
Definitions
Spreading over; extending across. They rested beneath the overspreading branches of the oak.