I was reading about today's killer tornadoes in Oklahoma City and saw a reference to 'lemon size hail.'
I found this list of names used for the various sizes of hailstones.
Name/Diameter (inches)
Pea .25 inch
Marble .50
Dime/Penny .75
Nickel .88
Quarter 1.00
Half Dollar 1.25
Walnut 1.50
Golf Ball 1.75
Lemon 2.00
Tennis Ball 2.50
Baseball 2.75
Tea Cup 3.00
Grapefruit 4.00
Here in Colorado once we get past the nickel and dime stage, it seems to go from 'golf ball' to 'tennis ball.'