Astanga Hrudaya
त्यक्तद्रवत्वं पाकादिकर्मणाऽनलशब्दितम्। पचत्यन्नं विभजते सारकिट्टौ पृथक् तथा॥११॥
It is called by the term Anala- fire because of its function of Paka – digestion and transformation of food materials. It cooks the food, divides it into essence and waste,
english translation