1. (physics) sound waves having frequency below the human audible range (below about 20 Hz)

Encyclopedia: Infrasound

• atrioventricular node
• atrioventricular trunk
• atrioventricular valve
• atrip
• Atriplex
• Atriplex hortensis
• Atriplex hymenelytra
• Atriplex lentiformis
• Atriplex mexicana
• atrium
• atrium cordis
• atrium dextrum
• atrium of the heart
• atrium sinistrum
• atrocious
• atrociously
• atrociousness
• atrocity
• Atromid-S
• Atropa
• Atropa belladonna
• atrophedema
• atrophic
• atrophic arthritis
• atrophied