floater

spots before the eyes caused by opaque cell fragments in the vitreous humor and lens; "floaters seem to drift through the field of vision"

a debt instrument with a variable interest rate tied to some other interest rate (e.g. the rate paid by T-bills)

a wanderer who has no established residence or visible means of support

an employee who is reassigned from job to job as needed

a voter who votes illegally at different polling places in the same election

a swimmer who floats in the water

an object that floats or is capable of floating

an insurance policy covering loss of movable property (e.g. jewelry) regardless of its location