Priapism is caused by leukemia, sickle cell disease, spinal cord injury, a rare side effect of the anti-depressant trazodone (Desyrel) or an overdose of self-injected chemicals to treat impotence.
The formation of numerous, closely spaced rills due to the uneven removal of surface soil by streamlets of running water. Also known as rilling; rill wash; rillwork.