vegetable compartment; crisper drawer
Refers specifically to the chilled drawer or compartment in a refrigerator designed for storing vegetables and sometimes fruits.
I put the lettuce in the refrigerator's vegetable compartment.
冷凍室 is the freezer compartment, whereas 野菜室 is a chilled but not freezing drawer for vegetables.
Compound of 野菜 (vegetable) and 室 (room, compartment).