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countable and uncountable, plural sunbursts
(countable) A figure or shape showing rays radiating from a central point. examples
(countable) A strong outburst of sunlight. examples
(uncountable) A style of finish for musical instruments such as guitars, having an area of lighter color (often showing the wood grain underneath) that darkens gradually towards a dark outer rim. quotations examples
The L-30 was finished all over in black, the L-37 in sunburst.
1996, Ken Achard, The History and Development of the American Guitar, page 10