Etymology: fever

This word comes from Old English fefor, or fefer, which is from the Latin febris and is related to another Latin word fovere meaning “to warm, or heat.”  There is some debate on the origin of febris or foever.  Some linguists think it’s from the PIE root dhegh-, meaning “burn.”  Others speculate it comes from an old Sanskrit word element bhur-, meaning “to be restless.”