A color occupying a position in the spectrum between green and orange. For individual y. dyes see specific name. [A.S. geolu]
- indicator y. a compound formed in the bleaching of rhodopsin by light; it is chrome y. at pH 3.3–4.0 and pale y. at pH 9.0–10.0.
- tumeric y. SYN: curcumin.
- visual y. SYN: all-trans-retinal.
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yel·low (yelґo) 1. a color between orange and green, produced by energy of wavelengths between 570 and 590 nm. 2. a dye or stain with this color.Medical dictionary. 2011.