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

Encyclopedia: Infrasound

• matrix inversion
• matrix multiplication
• matrix operation
• matrix printer
• matrix transposition
• matron
• matron of honor
• matron of honour
• matronly
• matronymic
• matsyendra
• matt
• matt-up
• matte
• matte up
• Wycherley
• Wyclif
• Wycliffe
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• Wyeth
• Wyethia amplexicaulis
• Wyethia helianthoides
• Wykeham
• Wykehamist
• Wyler