CATEGORIZATION OF AMA AT DIFFERENT LEVELS OF AGNI
Word Ama has its origin from root 'Am', with the suffix 'Ninj' having the meaning i.e. the substance, which is not digested properly and needs further digestion. i.e. substance which is incompletely metabolised or partially metabolised is called as Ama. i.e. the substance which creates disturbance in Srotas (channels) is called Ama.
Again the word Ama in literal meaning can be seen as = (as a prefix to verbs and nouns) near, near to, towards. = poison.
So Ama denotes a substance or group of substances which is near to poison or acts like a poison. So a substance which harms normal healthy state of body or any part of body can be considered as Ama. Therefore depending upon etymology Ama can be described as - raw, uncooked, unripe, immature, undigested or incompletely oxidised/metabolised or similar to a poisonous substance.