All 11 Uses of

undulate

in

Moby Dick

Whether it was that this undulating tester rolled the savage away to far distant scenes, I know not, but he now spoke of his native island; and, eager to hear his history, I begged him to go on and tell it.†
Chpt 10-12 *

The huge corpulence of that Hogarthian monster undulates on the surface, scarcely drawing one inch of water.†
Chpt 55-57

The living whale, in his full majesty and significance, is only to be seen at sea in unfathomable waters; and afloat the vast bulk of him is out of sight, like a launched line-of-battle ship; and out of that element it is a thing eternally impossible for mortal man to hoist him bodily into the air, so as to preserve all his mighty swells and undulations.†
Chpt 55-57

undulations = smooth wave-like motions

Then, again, in mountainous countries where the traveller is continually girdled by amphitheatrical heights; here and there from some lucky point of view you will catch passing glimpses of the profiles of whales defined along the undulating ridges.†
Chpt 55-57

For leagues and leagues it undulated round us, so that we seemed to be sailing through boundless fields of ripe and golden wheat.†
Chpt 58-60

No perceptible face or front did it have; no conceivable token of either sensation or instinct; but undulated there on the billows, an unearthly, formless, chance-like apparition of life.†
Chpt 58-60

But lazily undulating in the trough of the sea, and ever and anon tranquilly spouting his vapoury jet, the whale looked like a portly burgher smoking his pipe of a warm afternoon.†
Chpt 61-63

While composing a little treatise on Eternity, I had the curiosity to place a mirror before me; and ere long saw reflected there, a curious involved worming and undulation in the atmosphere over my head.†
Chpt 85-87

Nor does this—its amazing strength, at all tend to cripple the graceful flexion of its motions; where infantileness of ease undulates through a Titanism of power.†
Chpt 85-87

There is, one knows not what sweet mystery about this sea, whose gently awful stirrings seem to speak of some hidden soul beneath; like those fabled undulations of the Ephesian sod over the buried Evangelist St. John.†
Chpt 109-111

undulations = smooth wave-like motions

But as the last whelmings intermixingly poured themselves over the sunken head of the Indian at the mainmast, leaving a few inches of the erect spar yet visible, together with long streaming yards of the flag, which calmly undulated, with ironical coincidings, over the destroying billows they almost touched;—at that instant, a red arm and a hammer hovered backwardly uplifted in the open air, in the act of nailing the flag faster and yet faster to the subsiding spar.†
Chpt 133-135

Definition:

a smooth wave-like motion (physical or auditory)

or:

having a wavy or rippled form or surface