Roget's Thesaurus: Entry 427 (Semitransparency)

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#427. Semitransparency. -- N. semitransparency, translucency, semiopacity; opalescence, milkiness, pearliness[obs]; gauze, muslin; film; mica, mother-of-pearl, nacre; mist &c. (cloud) 353.

[opalescent jewel] opal.

turbidity &c. 426a.

Adj. semitransparent, translucent, semipellucid[obs], semidiaphanous[obs], semiopacous[obs], semiopaque; opalescent, opaline[obs]; pearly, milky; frosted, nacreous.

V. opalesce.