1. small openings on the surface of insects and some other arthropods through which they breathe
Usage: biology
2. blowholes on the heads of whales, dolphins, and other cetaceans
Usage: marine biology
3. small openings on the heads of sharks and rays behind the eyes
Usage: marine biology

Examples

• The butterfly’s spiracles allow air to flow into its respiratory system.
• Insects close their spiracles to prevent water loss in dry conditions.
• The whale surfaced and expelled air through its spiracles.
• Dolphins can control their spiracles to prevent water from entering while diving.
• The shark’s spiracles help it breathe when resting on the ocean floor.
• Scientists studied the spiracles of various insect species to understand their breathing patterns.