WordWeb Online

1. Impossible or nearly impossible to see; imperceptible by the eye
   "invisible rays"; "an invisible hinge"; "invisible mending"; "the invisible man";
   - unseeable
    
2. Not prominent or readily noticeable
   "the invisible man";
   - inconspicuous

1. An invisible export or import etc.

Derived forms: invisibles

See also: camouflaged, concealed, conspicuousness, covert, hidden, imperceptible, infrared, lightless, nonvisual, obscure, occult, out of sight, ultraviolet, undetectable, unnoticeable, unperceivable, unseen

Antonym: visible

Encyclopedia: Invisible