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Comprehensive
Dictionary Suite
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atom an invisible component of any element, consisting of protons, neutrons, and electrons, once considered the smallest possible unit of matter. [1/2 definitions]
big brother (cap.) in the 1948 novel Nineteen Eighty-Four by George Orwell, an invisible but all-seeing and omnipotent force representing totalitarian government. [1/3 definitions]
black light ultraviolet or infrared radiation that is invisible but indirectly detectable, as by fluorescence.
effluvium an outflow of usu. invisible, foul-smelling vapor or gas.
infrared the invisible electromagnetic radiation next to and longer in wavelength than those of the visible red end of the spectrum. [1/2 definitions]
invisible someone or something that is invisible. [1/5 definitions]
slip stitch a loose, continuous stitch, as on a facing or hem, in which the needle takes up only a few threads of the fabric so that it will be invisible on the outside.
unseen not seen, observed, or discovered; invisible; unnoticed. [1/2 definitions]