1. [n]  the quality or state of the chromatic color resembling the hue of sunflowers or ripe lemons
2. [adj]  (informal) easily frightened
3. [adj]  similar to the color of an egg yolk
4. [adj]  affected by jaundice which causes yellowing of skin etc
5. [adj]  cowardly or treacherous; "the little yellow stain of treason"-M.W.Straight; "too yellow to stand and fight"
6. [adj]  changed to a yellowish color by age; "yellowed parchment"
7. [adj]  (archaic) showing or experiencing a state of disordered feeling or distorted judgment as through bitterness or melancholy; "all looks yellow to the jaundiced eye"-Alexander Pope
8. [v]  turn yellow; "The pages of the book began to yellow"

Yellow
Simple text and pictures introduce things that are yellow, including a hair ribbon, raincoat, truck, and flower.

more details ...

1. \Yel"low\, a.
   1. Cowardly; hence, dishonorable; mean; contemptible; as, he
      has a yellow streak. [Slang]
   2. Sensational; -- said of some newspapers, their makers,
      etc.; as, yellow journal, journalism, etc. [Colloq.]
   

2. \Yel"low\, a. [Compar. {Yellower}; superl. {Yellowest}.]
   [OE. yelow, yelwe, [yogh]elow, [yogh]eoluw, from AS. geolu;
   akin to D. geel, OS. & OHG. gelo, G. gelb, Icel. gulr, Sw.
   gul, Dan. guul, L. helvus light bay, Gr. ? young verdure, ?
   greenish yellow, Skr. hari tawny, yellowish. ???. Cf.
   {Chlorine}, {Gall} a bitter liquid, {Gold}, {Yolk}.]
   Being of a bright saffronlike color; of the color of gold or
   brass; having the hue of that part of the rainbow, or of the
   solar spectrum, which is between the orange and the green.
         Her yellow hair was browded [braided] in a tress.
                                                  --Chaucer.
         A sweaty reaper from his tillage brought First fruits,
         the green ear and the yellow sheaf.      --Milton.
         The line of yellow light dies fast away. --Keble.
   {Yellow atrophy} (Med.), a fatal affection of the liver, in
      which it undergoes fatty degeneration, and becomes rapidly
      smaller and of a deep yellow tinge. The marked symptoms
      are black vomit, delirium, convulsions, coma, and
      jaundice.
   {Yellow bark}, calisaya bark.
   {Yellow bass} (Zo["o]l.), a North American fresh-water bass
      ({Morone interrupta}) native of the lower parts of the
      Mississippi and its tributaries. It is yellow, with
      several more or less broken black stripes or bars. Called
      also {barfish}.
   {Yellow berry}. (Bot.) Same as {Persian berry}, under
      {Persian}.
   {Yellow boy}, a gold coin, as a guinea. [Slang] --Arbuthnot.
   {Yellow brier}. (Bot.) See under {Brier}.
   {Yellow bugle} (Bot.), a European labiate plant ({Ajuga
      Cham[ae]pitys}).
   {Yellow bunting} (Zo["o]l.), the European yellow-hammer.
   {Yellow cat} (Zo["o]l.), a yellow catfish; especially, the
      bashaw.
   {Yellow copperas} (Min.), a hydrous sulphate of iron; --
      called also {copiapite}.
   {Yellow copper ore}, a sulphide of copper and iron; copper
      pyrites. See {Chalcopyrite}.
   {Yellow cress} (Bot.), a yellow-flowered, cruciferous plant
      ({Barbarea pr[ae]cox}), sometimes grown as a salad plant.
   {Yellow dock}. (Bot.) See the Note under {Dock}.
   {Yellow earth}, a yellowish clay, colored by iron, sometimes
      used as a yellow pigment.
   {Yellow fever} (Med.), a malignant, contagious, febrile
      disease of warm climates, attended with jaundice,
      producing a yellow color of the skin, and with the black
      vomit. See {Black vomit}, in the Vocabulary.
   {Yellow flag}, the quarantine flag. See under {Quarantine},
      and 3d {Flag}.
   {Yellow jack}.
   (a) The yellow fever. See under 2d {Jack}.
   (b) The quarantine flag. See under {Quarantine}.
   {Yellow jacket} (Zo["o]l.), any one of several species of
      American social wasps of the genus {Vespa}, in which the
      color of the body is partly bright yellow. These wasps are
      noted for their irritability, and for their painful
      stings.
   {Yellow lead ore} (Min.), wulfenite.
   {Yellow lemur} (Zo["o]l.), the kinkajou.
   {Yellow macauco} (Zo["o]l.), the kinkajou.
   {Yellow mackerel} (Zo["o]l.), the jurel.
   {Yellow metal}. Same as {Muntz metal}, under {Metal}.
   {Yellow ocher} (Min.), an impure, earthy variety of brown
      iron ore, which is used as a pigment.
   {Yellow oxeye} (Bot.), a yellow-flowered plant
      ({Chrysanthemum segetum}) closely related to the oxeye
      daisy.
   {Yellow perch} (Zo["o]l.), the common American perch. See
      {Perch}.
   {Yellow pike} (Zo["o]l.), the wall-eye.
   {Yellow pine} (Bot.), any of several kinds of pine; also,
      their yellowish and generally durable timber. Among the
      most common are valuable species are {Pinus mitis} and {P.
      palustris} of the Eastern and Southern States, and {P.
      ponderosa} and {P. Arizonica} of the Rocky Mountains and
      Pacific States.
   {Yellow plover} (Zo["o]l.), the golden plover.
   {Yellow precipitate} (Med. Chem.), an oxide of mercury which
      is thrown down as an amorphous yellow powder on adding
      corrosive sublimate to limewater.
   {Yellow puccoon}. (Bot.) Same as {Orangeroot}.
   {Yellow rail} (Zo["o]l.), a small American rail ({Porzana
      Noveboracensis}) in which the lower parts are dull yellow,
      darkest on the breast. The back is streaked with brownish
      yellow and with black, and spotted with white. Called also
      {yellow crake}.
   {Yellow rattle}, {Yellow rocket}. (Bot.) See under {Rattle},
      and {Rocket}.
   {Yellow Sally} (Zo["o]l.), a greenish or yellowish European
      stone fly of the genus {Chloroperla}; -- so called by
      anglers.
   {Yellow sculpin} (Zo["o]l.), the dragonet.
   {Yellow snake} (Zo["o]l.), a West Indian boa ({Chilobothrus
      inornatus}) common in Jamaica. It becomes from eight to
      ten long. The body is yellowish or yellowish green, mixed
      with black, and anteriorly with black lines.
   {Yellow spot}.
   (a) (Anat.) A small yellowish spot with a central pit, the
       fovea centralis, in the center of the retina where vision
       is most accurate. See {Eye}.
   (b) (Zo["o]l.) A small American butterfly ({Polites Peckius})
       of the Skipper family. Its wings are brownish, with a
       large, irregular, bright yellow spot on each of the hind
       wings, most conspicuous beneath. Called also {Peck's
       skipper}. See Illust. under {Skipper}, n., 5.
   {Yellow tit} (Zo["o]l.), any one of several species of
      crested titmice of the genus {Machlolophus}, native of
      India. The predominating colors of the plumage are yellow
      and green.
   {Yellow viper} (Zo["o]l.), the fer-de-lance.
   {Yellow warbler} (Zo["o]l.), any one of several species of
      American warblers of the genus {Dendroica} in which the
      predominant color is yellow, especially {D. [ae]stiva},
      which is a very abundant and familiar species; -- called
      also {garden warbler}, {golden warbler}, {summer
      yellowbird}, {summer warbler}, and {yellow-poll warbler}.
   {Yellow wash} (Pharm.), yellow oxide of mercury suspended in
      water, -- a mixture prepared by adding corrosive sublimate
      to limewater.
   {Yellow wren} (Zo["o]l.)
   (a) The European willow warbler.
   (b) The European wood warbler.
   

3. \Yel"low\, n.
   1. A bright golden color, reflecting more light than any
      other except white; the color of that part of the spectrum
      which is between the orange and green. ``A long motley
      coat guarded with yellow.'' --Shak.
   2. A yellow pigment.
   {Cadmium yellow}, {Chrome yellow}, {Indigo yellow}, {King's
   yellow}, etc. See under {Cadmium}, {Chrome}, etc.
   {Naples yellow}, a yellow amorphous pigment, used in oil,
      porcelain, and enamel painting, consisting of a basic lead
      metantimonate, obtained by fusing together tartar emetic
      lead nitrate, and common salt.
   {Patent yellow} (Old Chem.), a yellow pigment consisting
      essentially of a lead oxychloride; -- called also
      {Turner's yellow}.
   

4. \Yel"low\, v. t. [imp. & p. p. {Yellowed}; p. pr. & vb.
   n. {Yellowing}.]
   To make yellow; to cause to have a yellow tinge or color; to
   dye yellow.
   

5. \Yel"low\, v. i.
   To become yellow or yellower.
   

A language from SRI proposed to meet the Ironman requirements which led to Ada.

["On the YELLOW Language Submitted to the DoD", E.W. Dijkstra, SIGPLAN Notices 13(10):22-26, Oct 1978].