Roget's Thesaurus of English Words and Phrases by Peter Mark Roget

427. Semitransparency — N. semitransparency, translucency,

semiopacity; opalescence, milkiness, pearliness†; gauze, muslin; film; mica, mother-of-pearl, nacre; mist &c (cloud) 353. [opalescent jewel] opal. turbidity &c 426.1. Adj. semitransparent, translucent, semipellucid†, semidiaphanous†, semiopacous†, semiopaque; opalescent, opaline†; pearly, milky; frosted, nacreous. V. opalesce. (ii) SPECIFIC LIGHT