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Belonging to Apicius, a notorious Roman epicure; hence applied to whatever is peculiarly refined or dainty and expensive in cookery. H. Rogers.

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…

An ornamental appendage of wood at the ship's stern, usually spreading like a fan and curved like a bird's feather. Audsley.

Connected with the apogee; as, apogean (neap) tides, which occur when the moon has passed her apogee.

hing provided as a substitute; a makeshift. He goes to work devising apologies for window curtains. Dickens.

The small hollow curvature given to the top or bottom of the shaft of a column where it expands to meet the edge of the fillet; -- called also the scape. Parker.

A mineral relating to the zeolites, usually occurring in square prisms or octahedrons with pearly luster on the cleavage surface. It is a hydrous silicate of calcium and potassium.

The first appearance of a star or other luminary after having been invisible or obscured; -- opposed to occultation. Circle of perpetual apparition. See under Circle.

s distinguished from supplement, which is intended to supply deficiencies and correct inaccuracies.

, right line applied at right angles to the axis of any conic section, and bounded by the curve.

Accurate perception; true estimation; as, an appreciation of the difficulties before us; an appreciation of colors. His foreboding showed his appreciation of Henry's character. J. R. Green.

So as to secure approbation; in an approved manner.

Near correctness; nearly exact; not perfectly accurate; as, approximate results or values. Approximate quantities (Math.), those which are nearly, but not, equal.

In a curve referred to polar coördinates, any point for which the radius vector is a maximum or minimum.

Curving; hooked; prominent, like the beak of an eagle; -- applied particularly to the nose Terribly arched and aquiline his nose. Cowper.

control; a ruler; a governor. Though Heaven be shut, And Heaven's high Arbitrators sit secure. Milton. Masters of their own terms and arbitrators of a peace. Addison.

A portion of a curved line; as, the arc of a circle or of an ellipse.

Any part of a curved line.

Made with an arch or curve; covered with an arch; as, an arched door.

The architectural member surrounding the curved opening of an arch, corresponding to the architrave in the case of a square opening.