“root”, “base”, the Foundation “, originally”, “source”. In Physiology, the root is the base of the spine, the center of the pelvic floor, a female the uterus.
We find this prefix in : Mūla Bandha, Mūlādhāracakra, Ūrdhva śvānāsana, Uḍḍiyāna bandha Mūlāsana mukha, etc.
Mūla
"root", "base", the Foundation ", originally", "source".