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n, especially from truth or moral rectitude, from the natural state, or from a type. "The aberration of youth." Hall. "Aberrations from theory." Burke.

Characterized by aberration.

sive powers, as crown and flint glass, with the curvatures so adjusted that the chromatic aberration produced by the one is corrected by other, and light emerges from the compound lens undecomposed. -- Achromatic prism. See Prism. -- Achromatic telescope, or microscope, one in which the chromatic aberration is correc…

Having two or more parts of different curvatures, so combined as to remove spherical aberration; -- said of a lens. Aplanatic focus of a lens (Opt.), the point or focus from which rays diverging pass the lens without spherical aberration. In certain forms of lenses there are two such foci; and it is by taking advantage…

Freedom from spherical aberration.

Free from chromatic and spherical aberration; -- said esp. of a lens in which rays of three or more colors are brought to the same focus, the degree of achromatism thus obtained being more complete than where two rays only are thus focused, as in the ordinary achromatic objective. --Ap`o*chro"ma*tism (#), n.…

ments or decoration representing a crown; as, the paper is stamped with a crown. Crown of aberration (Astron.), a spurious circle around the true circle of the sun. -- Crown antler (Zoöl.), the topmost branch or tine of an antler; also, an antler having a cuplike top, with tines springing from the rim. -- Crown bar,…

Aberration of mind; delirium. J. Motley. Deliration or alienation of the understanding. Mede.

A poison which occasions a persistent delirium, or mental aberration (as belladonna).

which the thoughts, expressions, and actions are wild, irregular, and incoherent; mental aberration; a roving or wandering of the mind, -- usually dependent on a fever or some other disease, and so distinguished from mania, or madness.

in a day; constituting the measure of a day; as, a diurnal fever; a diurnal task; diurnal aberration, or diurnal parallax; the diurnal revolution of the earth. Ere twice the horses of the sun shall bring Their fiery torcher his diurnal ring. Shak.

An arrangement of two lenses for a microscope, designed to correct spherical aberration and chromatic dispersion, thus rendering the image of an object more clear and distinct. W. H. Wollaston.

rface which gives for parallel rays (as those from very distant objects) images free from aberration. It is used in reflecting telescopes. -- Parabolic spindle, the solid generated by revolving the portion of a parabola cut off by a line drawn at right angles to the axis of the curve, about that line as an axis. -- P…

An instrument formed by combining prisms so as to correct the chromatic aberration of the light while linear dimensions of objects seen through the prisms are increased or diminished; -- called also prism telescope. Sir D. Brewster.

gnifying glass consisting of two plano-convex lenses. It is designed to correct spherical aberration and chromatic dispersion.