windmill

noun

1. a mill that is powered by the wind

Definition categories: man–made, grinder, mill

2. generator that extracts usable energy from winds

Similar word(s): aerogenerator

Definition categories: man–made, generator

verb

1. (transitive, intransitive) To rotate (itself) with a sweeping motion.

- She ran down the hill, windmilling her arms with glee.

2. (intransitive) Of a rotating part of a machine, to (become disengaged and) rotate freely.

- The axle broke and the wheel windmilled in place briefly before careening through the wall.