sem·i·o·paque

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

Origin:
1685–95; semi- + opaque

sem·i·o·pac·i·ty [sem-ee-oh-pas-i-tee, sem-ahy-] , noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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WordNet
semiopaque

adjective
partially opaque 
WordNet® 3.0, © 2006 by Princeton University.
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00:10
Semiopaque is always a great word to know.
So is ninnyhammer. Does it mean:
a fool or simpleton; ninny.
a scrap or morsel of food left at a meal.
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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