The Avestan word xšuuid-
Word xšuuid-
Meaning milk
See also Proto-Indo-European: *(k)sweid- ‘milk’

Other words that might be of interest
xᵛar- ‘to consume, to eat, to drink’, baourvō ‘food’, x˅arəθa- ‘food’, raēθβaiia- ‘to mix’