1. windmilling - Noun
2. windmilling - Verb
windmilling
present participle of windmill
windmilling (uncountable)
The process of milling with a windmill.
He sat in the right-hand pilot seat while the left-hand seat commander, Stan Butchart, flew the B-29. citation As they ascended to convert, the number-four engine stopped and the propeller began windmilling (rotating freely) in the airstream. Source: Internet
The windmilling propeller made the engine continue to spin without delivering any power as the aircraft descended. Source: Internet