Longman Dictionary of Contemporary English homepage

Date: 1400-1500
Language: Latin
Origin: opacus 'dark'

opaque

adjective
     
o‧paque [usually before noun]
1 opaque glass or liquid is difficult to see through and often thick [≠ transparent]:
a shower with an opaque glass door
2 formal difficult to understand:
an opaque style of writing
opaqueness noun [uncountable]

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