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matter of the heart definition, matter of the heart meaning | English dictionary. matter. 2 substance that occupies space and has mass, as distinguished from substance that is mental, spiritual, etc. n the substance or main theme of a book, discussion, debate, etc.
By Sam Bourne. The heart is a crucial organ, so anytime something seems off, it can be cause for worry. While it can be indicative of many different things, a heart murmur in dogs can range from being innocent and non-harmful to symptomatic of a potentially life threatening ailment. The heart is the very definition of a vital organ, so when it starts making weird noises, people tend to grow concerned.