Atrium of the heart and Atrium

Atrium of the heart noun - The upper chamber of each half of the heart.

Atrium and atrium of the heart are semantically related. In some cases you can use "Atrium" instead a noun phrase "Atrium of the heart".

Atrium noun - Any chamber that is connected to other chambers or passageways (especially one of the two upper chambers of the heart).

Atrium of the heart and atrium are semantically related. Sometimes you can replace phrase "Atrium of the heart" with "Atrium", this terms are similar.