Anauṣadha (Anausadha) is one of the thousand names of God Śiva (Siva) .Nīlakaṇṭha (Nilakantha), the commentator, has explained the meaning of the name, saying —
anauṣadhaḥ vṛhyādyanna jātīya rahitaḥ abhokteti yāvat.
By auṣadha or medicine, we generally understood remedies or herbal drugs that cure several bodily diseases, but it also means food for sustenance. Śiva is above and beyond all worldly notions of hunger, thirst and illness — he des not require  a regular diet of rice, vegetables etc. — that a human being consumes. So he is called Anauṣadha.