Make Your Editor Cry: Echo (Awkward Plural)
BLUF: (Bottom Line Up Front)
The plural of echo is echoes or rarely echos.
echo: the repetition of a sound caused by reflection of sound waves: the sound due to such reflection
The singular of echo is echo. The plural of echo is properly echoes or less commonly and in my opinion wrongly echos. You can use either, just be consistent throughout the entire text. Either plural conforms to the standard rules for forming the plurals of nouns in English.
Animals that use echoes are cetaceans.
People always seem to see echos of their own lives in my films. (Jill Clayburgh)
Gregg Bridgeman is the Editor-in-Chief at Olivia Kimbrell Press. He is husband to best-selling Christian author Hallee Bridgeman and parent to three. He continues to proudly serve in the US Armed Forces and has done so in either an active or reserve capacity for more than twenty years as an airborne and air assault qualified paratrooper, earning a Bronze Star for his service. Most importantly, he was ordained in October of 2001 after surrendering his life to Christ decades earlier.