Rye is a low-gluten cereal grain (Secale cereale) of the
triticeae tribe that I did not see in India, even when looking for
it. The cultivation of rye was greatest from western Turkey into
eastern Europe where it was sold to impoverished folks. Rye is much
cheaper than wheat due to its bitter taste and low gluten content.
The low gluten reduces its nutritive value and makes it hard to
handle. Production in traditional areas of high production is
falling steeply. Rye is also used in the production of rye whiskey.
So rather than a translation, may I suggest we use a description?
"Bitter grain" or some such might work. May I suggest कड़वा अनाज
(kaduah anhja)? n.b. I have seen "ragi" रागी given as a
translation, but raqi is millet which are small, globular round
grass seeds, members of Poanceae. Rye, on the other hand, is an
elongated seed and member of Triticeae, the wheat family.