opacity 1
noundomain: natural phenomenon
Princeton WordNet [ver.3.1]
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EnglishDefinition
the phenomenon of not permitting the passage of electromagnetic radiation
Hypernym
a natural phenomenon involving the physical properties of matter and energy
EnglishAntonym
transparency 1
noun
permitting the free passage of electromagnetic radiation
Derivationally related form
opaque 1
adjective
not transmitting or reflecting light or radiant energy; impenetrable to sight
Hyponym
opacity to light
radiopacity 1
noun
opacity to X-rays or other radiation
