[sem-ee-oh-peyk, sem-ahy-]
partly or nearly opaque.

1685–95; semi- + opaque

semiopacity [sem-ee-oh-pas-i-tee, sem-ahy-] , noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
The oil in which the hazardous materials are suspended is semiopaque to sunlight, which would tend to keep photodecomposition low.
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