"Diaphragmatic" refers to something related to the diaphragm, which is a sheet of muscle in the body that separates the chest cavity from the abdominal cavity. Full definition
Our extensive leadership in research offers our patients access to the latest clinical trials, and we are often one of only a few centers offering access to certain therapies, such as the lung - growth trials for patients with congenital diaphragmatic hernia. (mottchildren.org)
It is a practice of deep diaphragmatic breathing, meant to be done in a quiet and controlled setting. (mindbodygreen.com)
By taking deep diaphragmatic breaths in a moment of anxiety, we activate the parasympathetic system that tells our mind, «All is well.» (mindbodygreen.com)