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