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A variety of quartz or chalcedony, exhibiting opalescent reflections from within, like the eye of a cat. The mane is given to other gems affording like effects, esp. the chrysoberyl.

Relating to, or having the properties of, a caustic curve formed by reflection. See Caustic, a. Nichol.

That part of acoustics which treats of reflected sounds or echoes See Acoustics. Hutton.

Pertaining to, produced by, or involving, both the reflection and refraction of light; as, a catadioptric light. Hutton.

A reflecting optical glass or instrument; a mirror. [Obs.]

Of or pertaining to catoptrics; produced by reflection. Catoptric light, a light in which the rays are concentrated by reflectors into a beam visible at a distance.

That part of optics which explants the properties and phenomena of reflected light, and particularly that which is reflected from mirrors or polished bodies; --- formerly caled anacamptics.

; sharp; as, a caustic remark. Caustic curve (Optics), a curve to which the ray of light, reflected or refracted by another curve, are tangents, the reflecting or refracting curve and the luminous point being in one plane. -- Caustic lime. See under Lime. -- Caustic potash, Caustic soda (Chem.), the solid hydroxides…

ence, a support or frame. Cheval glass, a mirror swinging in a frame, and large enough to reflect the full leght figure.

A reflecting telescope, part of which is made to rotate eccentrically, so as to produce a ringlike image of a star, instead of a point; -- used in studying the scintillation of the stars.

A South African mole of the genus Chrysochloris; the golden mole, the fur of which reflects brilliant metallic hues of green and gold.

A slightly convex mirror, commonly of black glass, used as a toy for viewing the reflected landscape.

cattered passages and puts them together in one book. Volumes without the collector's own reflections. Addison.

une under both kinds. Bp. Burnet. To commune with one's self or one's heart, to think; to reflect; to meditate.

The faculty of the reflective group which is supposed to perceive resemblances and contrasts. Beyond comparison, so far superior as to have no likeness, or so as to make comparison needless. -- In comparison of, In comparison with, as compared with; in proportion to. [Archaic] "So miserably unpeopled in comparison of…

-- said of things. [Obs.] From these laws may be deduced the rules of the congresses and reflections of two bodies. Cheyne.

ly two concave mirrors so placed that rays proceeding from the principal focus of one and reflected in a parallel beam are received upon the other and brought to the principal focus. -- Conjugate point (Geom.), an acnode. See Acnode, and Double point. -- Self-conjugate triangle (Conic Sections), a triangle each of wh…

To think seriously; to make examination; to reflect; to deliberate. We will consider of your suit. Shak. 'T were to consider too curiously, to consider so. Shak. She wished she had taken a moment to consider, before rushing down stairs. W. Black

Given to consideration or to sober reflection; regardful of consequences or circumstances; circumspect; careful; esp. careful of the rights, claims, and feelings of other. Of dauntless courage and considerate pride. Milton. considerate, and careful of his people. Dryden. The wisest and most considerate men in the world…

The result of delibration, or of attention and examonation; matured opinion; a reflection; as, considerations on the choice of a profession.