#424.  Shade. —­ N. shade; awning &c. (cover) 223; parasol, sunshade,
umbrella; chick; portiere; screen, curtain, shutter, blind, gauze, veil, chador, mantle, mask; cloud, mist, gathering. of clouds.
     umbrage, glade; shadow &c. 421.
     beach umbrella, folding umbrella. 
     V. draw a curtain; put up a shutter, close a shutter; veil &c. v.;
cast a shadow &c. (darken) 421. 
     Adj. shady, umbrageous. 
     Phr. “welcome ye shades! ye bowery thickets hail” [Thomson].

     #425.  Transparency. —­ N. transparence, transparency; clarity;
translucence, translucency; diaphaneity[obs3]; lucidity, pellucidity[obs3], limpidity; fluorescence; transillumination, translumination[obs3]. transparent medium, glass, crystal, lymph, vitrite[obs3], water. 
     V. be transparent &c. adj.; transmit light. 
     Adj. transparent, pellucid, lucid, diaphanous, translucent,
tralucent|, relucent[obs3]; limpid, clear, serene, crystalline, clear as crystal, vitreous, transpicuous[obs3], glassy, hyaline; hyaloid[Med], vitreform[obs3].

     #426.  Opacity.—­ N. opacity; opaqueness &c. adj.
film; cloud &c. 353. 
     V. be opaque &c. adj.; obstruct the passage of light; obfuscate,
offuscate|. 
     Adj. opaque, impervious to light; adiaphanous[obs3]; dim &c. 422;
turbid, thick, muddy, opacous|, obfuscated, fuliginous[obs3], cloud, hazy, misty, foggy, vaporous, nubiferous[obs3], muggy|| (turbidity) 426a.
     smoky, fumid[obs3], murky, dirty.

     #426a.  Turbidity —­ N. turbidity, cloudiness, fog, haze, muddiness,
haziness, obscurity.
      nephelometer[instrument to measure turbidity]. 
     Adj. turbid, thick, muddy, obfuscated, fuliginous[obs3], hazy, misty,
foggy, vaporous, nubiferous[obs3]; cloudy (cloud) 353.
     smoky, fumid[obs3], murky, dirty.

—­ p. 120 —­

     #427.  Semitransparency. —­ N. semitransparency, translucency,
semiopacity; opalescence, milkiness, pearliness[obs3]; gauze, muslin; film; mica, mother-of-pearl, nacre; mist &c. (cloud) 353.
     [opalescent jewel] opal.
     turbidity &c. 426a. 
     Adj. semitransparent, translucent, semipellucid[obs3],
semidiaphanous[obs3], semiopacous[obs3], semiopaque; opalescent, opaline[obs3]; pearly, milky; frosted, nacreous. 
     V. opalesce.

%
          (ii) SPECIFIC LIGHT
%

     #428.  Color. —­ N. color, hue, tint, tinge, dye, complexion, shade,
tincture, cast, livery, coloration, glow, flush; tone, key.
     pure color, positive color, primary color, primitive complementary
color; three primaries; spectrum, chromatic dispersion; broken color, secondary color, tertiary color. local color, coloring, keeping, tone, value, aerial perspective.
     [Science of color] chromatics, spectrum analysis, spectroscopy;
chromatism[obs3], chromatography||, chromatology[obs3].