noun An aircraft that is borne along by one or more sets of long rotating blades which allow it to hover, move in any direction including reverse, or land; and typically having a smaller set of blades on its tail to stabilize the aircraft.
We flew over the city in a helicopter.
noun A powered troweling machine with spinning blades used to spread concrete.
noun The winged fruit of certain trees, such as ash, elm, and maple.
noun A dragonfly; so named due to its resemblance to a helicopter (sense 1).
noun A whirling trick performed with devil sticks.
noun A breakdance move in which the dancer spins on the floor while extending the legs to resemble the blades of a helicopter.