1. a person who whistles
2. any of various birds or animals that make whistling sounds
3. a device that produces a whistling sound

Examples

• The talented whistler performed classical melodies at the talent show.
• She was known as the best whistler in her music class.
• The marmot is sometimes called a whistler because of its sharp alarm call.
• We heard a whistler bird in the forest during our hike.
• The tea kettle’s whistler let us know the water was ready.
• The old steam engine had a loud whistler that could be heard for miles.