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In ayurveda, ama is the concept of anything that exists in a state of incomplete transformation. In particular, it is claimed to be a toxic byproduct generated due to improper or incomplete digestion. The concept does not have a direct equivalent in standard medicine.
"Ama" is a Sanskrit word literally meaning "uncooked" or "undigested".
References
Kacera, Walter (2007). "Ama and Disease". Ayurvedic Tongue Diagnosis. Lotus Press. pp. 159–176. ISBN978-0-940985-77-3.