other names for phase speed
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
How to use wave speed in a sentence
In a vacuum there is no dying out of the waves, so that the group-speed and the wave-speed are identical.
The wave-speed is that required to carry a wave crest A to the position of the crest B in the wave time.