Read the dictionary definition of usable. All definitions for this word.
1. convenient for use or disposal
1. the house is available after July 1
2. 2000 square feet of usable office space
2. fit or ready for use or service
1. the toaster was still functional even after being dropped
2. the lawnmower is a bit rusty but still usable
3. an operational aircraft
4. the dishwasher is now in working order
3. capable of being put to use
1. usable byproducts