Try a normal_map of wood or onion normal with the sine_wave waveform
which blends to the same normal with a depth of 0.
I think this will work(UNTESTED):

normal {spherical   //Or cylinderical...
    normal_map {
        [0 wood 0 frequency 15]
        [1 wood 1 frequency 15]
    }
    //scale to right size and translate to desired position. Increase
the frequency of the wood pattern to get more waves.
}

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