fiddleback

noun

• 1 [usually as modifier] a thing shaped like the back of a violin, with the sides deeply curved inward, in particular.
• the back of a chair.

• 2a rippled effect in the grain of fine wood, often exploited when making the backs of violins: [as modifier]:fiddleback mahogany

• 3 (also fiddleback spider)another term for brown recluse.