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1-15 of 15 possibilities

invisible emanation aura
thin coating of ice (as from freezing mist) on a road or sidewalk; nearly invisible but very hazardous black ice
ice on roads or sidewalks, thin almost invisible black ice
darkness resulting from the extinction of lights (as in a city invisible to enemy aircraft) blackout , brownout , dimout
(cosmology) a hypothetical form of matter that is believed to make up 90 percent of the matter in the universe; it is invisible (does not absorb or emit light) and does not collide with atomic particles but exerts gravitational force dark matter
(Islam) an invisible spirit mentioned in the Koran and believed by Muslims to inhabit the earth and influence mankind by appearing in the form of humans or animals djinni , djinny , genie , jinnee , jinni
asexual spore of ferns that resembles dust; once thought to be seeds and to make the possessor invisible fern seed
light emitted during absorption of radiation of some other (invisible) wavelength fluorescence
invisible radiation between light and microwaves infrared
radiation between light and microwaves, invisible infrared
invisible spiritual being felt to be nearby presence
loose stitch catching only a thread or two of fabric; designed to be invisible from the right side slip stitch
something visible that by association or convention represents something else that is invisible symbol , symbolic representation , symbolisation , symbolization
invisible radiation between light and X rays ultraviolet
radiation between light and X-rays, invisible ultraviolet
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