Dear Martin and friends,
Some time back, I uploaded the volumes of the Ayurvediya Sabdakosa by Josi and Josi to archive.org. These volumes are a precious resource for ayurvedic vocab. "Agnidagdha" and "agnidāha" are on v.1, page five, with clear meanings and some references.
I recommend these volumes to everyone for checking out puzzling ayurvedic words.
Best,Dominik