herbal medicine
US /ˈɝː.bəl ˈmed.ɪ.sɪn/
UK /ˈɝː.bəl ˈmed.ɪ.sɪn/

1.
the study or practice of the medicinal and therapeutic use of plants, sometimes as a form of alternative medicine
:
•
Many cultures still rely on herbal medicine for primary healthcare.
•
She is studying herbal medicine to become a practitioner.