Origin: Latin suffix -al
Atrial has 2 different meanings across 1 category:
of or relating to a cavity or chamber in the body (especially one of the upper chambers of the heart)
"The doctor explained that his atrial fibrillation was caused by an irregular rhythm within the upper chambers of his heart."
Of or pertaining to an atrium, especially the atrium of the heart.
"The doctor explained that her irregular heartbeat was caused by a problem in her left atrial wall."