By M. A. Alwar
Sometimes transliterated as: Ilisah, IlIZaH, Ilishah
Ilīśaḥ is a masculine form.
Ilīśaḥ is derived from "ilanti apsu drutaṁ gacchantīti ela drutagāmino matsyāḥ teṣām īśaḥ" which means 'The king of ilas is a kind of fish which moves rapidly in water.
Perspectives of Purānas
As per śabdaratnāvalī
It is a kind of fish.
Vaidyakadravyaguṇa states that ilīśa is sweet, oily and cures deficiency of bile and phlegm, and also slow digestion.
Udbhaṭa Trans. “ilīśa excels nectar; vācā is beyond words; Rohita is said to be good for us; Madgura is dear to my guru”.
- Shabdakalpadrumah by Raja Radhakantdev, Varadaprasada Vasu, Haricarana Vasu