But to librate (rhyming in fact with vibrate) is eventually to seek rest by balancing out its wavering motions.    From Wordnik.com.  [Phonemanography: Romantic to Victorian] Reference

The irritative motions that belong to the sense of pressure, or of touch, are attended to, and the patient conceives the bed to librate, and is fearful of falling out of it.    From Wordnik.com.  [Zoonomia, Vol. I Or, the Laws of Organic Life] Reference

In the vertigo of intoxication, when the patient lies down in bed, it sometimes happens even in the dark, that the bed seems to librate under him, and he is afraid of falling out of it.    From Wordnik.com.  [Zoonomia, Vol. II Or, the Laws of Organic Life] Reference

The child then drops upon the ground, and the neighbouring objects seem to continue for some seconds of time to circulate around him, and the earth under him appears to librate like a balance.    From Wordnik.com.  [Zoonomia, Vol. I Or, the Laws of Organic Life] Reference

Whence the objects appear to librate or circulate according to the motions of our heads, which is called dizziness; and we lose the means of balancing ourselves, or preserving our perpendicularity, by vision.    From Wordnik.com.  [Zoonomia, Vol. II Or, the Laws of Organic Life] Reference

Those, who have been upon the water in a boat or ship so long, that they have acquired the necessary habits of motion upon that unstable element, at their return on land frequently think in their reveries, or between sleeping and waking, that they observe the room, they sit in, or some of its furniture, to librate like the motion of the vessel.    From Wordnik.com.  [Zoonomia, Vol. I Or, the Laws of Organic Life] Reference

Afterwards, when the eye becomes fatigued, a green spectrum in the form of a crescent is seen to librate on one side or other of the central circle, as by the unsteadiness of the eye a part of the fatigued retina falls on the white paper; and as by the increasing fatigue of the eye the central part of the silk appears paler, the edge on which the unfatigued part of the retina occasionally falls will appear of a deeper red than the original silk, because it is compared with the pale internal part of it.    From Wordnik.com.  [Zoonomia, Vol. I Or, the Laws of Organic Life] Reference

When we look long and attentively at any object, the eye cannot always be kept entirely motionless; hence, on inspecting a circular area of red silk placed on white paper, a lucid crescent or edge is seen to librate on one side or other of the red circle: for the exterior parts of the retina sometimes falling on the edge of the central silk, and sometimes on the white paper, are less fatigued with red light than the central part of the retina, which is constantly, exposed to it; and therefore, when they fall on the edge of the red silk, they perceive it more vividly.    From Wordnik.com.  [Zoonomia, Vol. I Or, the Laws of Organic Life] Reference

Erectum librate caput; nec pandere crura.    From Wordnik.com.  [Sagittulae, Random Verses] Reference

Never, indeed, can she be sufficiently grateful to the few patriot spirits of this period, to whose courage and eloquence she owes the high station of freedom yet left to her; -- never can her sons pay a homage too warm to the memory of such men as a Chatham, a Fox, and a Sheridan; who, however much they may have sometimes sacrificed to false views of expediency, and, by compromise with friends and coalition with foes, too often weakened their hold upon public confidence; however the attraction of the Court may have sometimes made them librate in their orbit, were yet the saving lights of Liberty in those times, and alone preserved the ark of the.    From Wordnik.com.  [Memoirs of the Life of the Rt. Hon. Richard Brinsley Sheridan — Volume 01] Reference