shading
noun
[ ˈʃeɪdɪŋ ]
• the darkening or colouring of an illustration or diagram with parallel lines or a block of colour.
• "scenes can be given perspective by colour and shading"
• a very slight variation.
• "the shadings of opinion even among those who are in broad agreement"
• a layer of paint or material used to provide shade, especially for plants.
• "liquid greenhouse shading"
shade
verb
• screen from direct light.
• "she shaded her eyes against the sun"
• darken or colour (an illustration or diagram) with parallel pencil lines or a block of colour.
• "she shaded in the outline of a chimney"
• narrowly win or gain an advantage in (a contest).
• "the Welsh side shaded a tight, tough first half"
• make a slight reduction in the amount, rate, or price of.
• "banks may shade the margin over base rate they charge customers"
Origin:
Old English sc(e)adu, of Germanic origin. Compare with shadow.