1.harsh or discordant sound: DISSONANCE
2. harshness in the sound of words or phrases
This week's definition comes from my tenth edition Merriam-Webster's Collegiate Dictionary.
I'm not entirely sure why this word has been in my head lately, but I do have to give it credit for sounding like its meaning. The hard /k/ sounds that start out this word immediately grind the ears, just like discordant sounds or noises would. It reminds me a little of a crow - caKAW! Honestly, who likes crows?
Check out the differences between crows and ravens at Ebird.org.