Here's something I'll paste from a OneLook source:
"ing of a bright saffronlike colour; of the colour 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.
<medicine> " (Keble) Yellow atrophy, 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.
Synonym: barfish. Yellow berry.
<botany> The European willow warbler. The European wood warbler.
Origin: OE. Yelow, yelwe, yelow, yeoluw, 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.
1. A bright golden colour, reflecting more light than any other except white; the colour of that part of the spectrum which is between the orange and green. "A long motley coat guarded with yellow."
2. A yellow pigment. Cadmium yellow, Chrome yellow, Indigo yellow, King's yellow, etc. See 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.
<chemistry> Patent yellow, a yellow pigment consisting essentially of a lead oxychloride.
Synonym: Turner's yellow.
Source: Websters Dictionary
(01 Mar 1998) "http://cancerweb.ncl.ac.uk/cgi-bin/omd?yellow