from The Century Dictionary.
Sorry, no etymologies found.
In southern Pakistan, for example, people whose food supplies are running low before the dates ripen, process and eat unripe dates. 5 The bright green, unripe dates called kimri are mashed in a basket, releasing some of their tannin-loaded juices.
By the next day the kimri have turned a mud color and lost much of their bitterness.
These kimri are then put in a ceramic jar which is wrapped in a blanket and left overnight.
Dates ripen in four stages, which are known throughout the world by their Arabic names kimri (unripe), khalal (full-size, crunchy), rutab (ripe, soft), tamr (ripe, sun-dried).