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One of the first three Gospels of the New Testament. See Synoptist.

Affording a general view of the whole, or of the principal parts of a thing; as, a synoptic table; a synoptical statement of an argument. "The synoptic Gospels." Alford. -- Syn*op"tic*al*ly, adv.

Father; religious superior; -- in the Syriac, Coptic, and Ethiopic churches, a title given to the bishops, and by the bishops to the patriarch.

red in the osculating plane of the curve. -- Absolute equation (Astron.), the sum of the optic and eccentric equations. -- Absolute space (Physics), space considered without relation to material limits or objects. -- Absolute terms. (Alg.), such as are known, or which do not contain the unknown quantity. Davies & Pe…

The fruit of Ammi Copticum, syn. Carum Ajowan, used both as a medicine and as a condiment. An oil containing thymol is extracted from it. Called also Javanee seed, Javanese seed, and ajava.

A loss or decay of sight, from loss of power in the optic nerve, without any perceptible external change in the eye; -- called also gutta serena, the "drop serene" of Milton.

That part of optics which treats of the refraction of light; -- commonly called dioptrics. Encyc. Brit.

to a right angle. -- Obtuse angle, one greater than a right angle, or more than 90º. -- Optic angle. See under Optic. -- Rectilineal or Right-lined angle, one formed by two right lines. -- Right angle, one formed by a right line falling on another perpendicularly, or an angle of 90º (measured by a quarter circle).…

different properties in different directions; thus, crystals of the isometric system are optically isotropic, but all other crystals are anisotropic.

An optical toy for producing amusing figures or pictures by means of two revolving disks, on one of which distorted figures are painted.

The diameter of the exposed part of the object glass of a telescope or other optical instrument; as, a telescope of four-inch aperture.

An optical property of some crystals which exhibit a star- shaped by reflected light, as star sapphire, or by transmitted light, as some mica.

Pertaining to autopsy; autoptical. [Obs.]

s of tension and compression, exerted by the fibers in any cross section of a girder. -- Optic axis of a crystal, the direction in which a ray of transmitted light suffers no double refraction. All crystals, not of the isometric system, are either uniaxial or biaxial. -- Optic axis, Visual axis (Opt.), the straight l…

ass prisms cemented together at their diagonal faces so as to form a cube; -- called also optical cube. It is used in one form of photometer.

The line bisecting the angle between the optic axes of a biaxial crystal.

th rudimentary eyes. -- Blind spot (Anat.), the point in the retina of the eye where the optic nerve enters, and which is insensible to light. -- Blind tooling, in bookbinding and leather work, the indented impression of heated tools, without gilding; -- called also blank tooling, and blind blocking. -- Blind wall,…

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

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.

Severe; satirical; 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…