Brontide
The low rumbling of distant thunder
“a low muffled sound like distant thunder heard in certain seismic regions esp. along seacoasts and over lakes and thought to be caused by feeble earth tremors”
Source: Merriam Webster
Commentary
I find in interesting that there is such a difference between what a word list I was shown and the offical Merriam Webster site. Has anyone seen this word before?