subsonic

Definition

having a frequency too low to be audible

Etymology

From sub- + sonic.

Example Sentences

• "The noise of the ship was all around her. The faint subsonic rumble of the reactor and drive. (Leviathan Wakes, James S. A. Corey)"
• "But British Airways Flight 112 made the trek in under five hours, setting a new record for the fastest subsonic commercial flight across the Atlantic Ocean."

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