a. [ad. mod.L. type *undulōs-us: cf. UNDULATE v. and -OUS. So Sp. and Pg. unduloso, F. onduleux.] Of an undulating nature. Hence (in recent use) Undulously adv.

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1728.  Chambers, Cycl., s.v. Undulation, The adjoining Liquid … forms the first undulous Circle.

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1862.  Lytton, Str. Story, xvii. A vague, dusky vapour, undulous, and coiling like a vast serpent. Ibid., lxx. Beyond stretch undulous pastures.

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1869.  Blackmore, Lorna D., lxv. He felt the undulous readiness of her volatile paces under him.

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1897.  F. Thompson, New Poems, 15.

        Lo, secret music, sweetest music,
From distances of distance drifting its lone flight,
Down the arcane where Night would perish in night,
Like a god’s loosened locks slips undulously.

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