When I saw my charmer thus come in accompanied by a cavalier, I seemed to hear a hiss, and the green snake of jealousy, rising on undulating coils from the moonlit balcony, glided within my waistcoat, and ate its way in two minutes to my heart’s core.
There are no more uses of "undulate" in the book.
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A sidewinding snake uses less energy to cover the same distance as a laterally undulating snake uses.
The dancers’ arms undulated in unison to add to the ethereal effect.