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extinct genus of Paleozoic Cephalopoda, having a long, straight, conical shell. The interior is divided into numerous chambers by transverse septa.

An orthoceras; also, any fossil shell allied to Orthoceras.

Common or potash feldspar crystallizing in the monoclinic system and having two cleavages at right angles to each other. See Feldspar.

Breaking in directions at right angles to each other; -- said of the monoclinic feldspars.

The diagonal or lateral axis in a monoclinic crystal which is at right angles with the vertical axis.

See the Note under Dome, 4.

Sound in opinion or doctrine, especially in religious doctrine; hence, holding the Christian faith; believing the doctrines taught in the Scriptures; -- opposed to Ant: heretical and Ant: heterodox; as, an orthodox Christian.

Pertaining to, or evincing, orthodoxy; orthodox. [R.] Milton.

Orthodoxness. [R.]

Orthodoxly. [R.] Milton

Orthodox. [Obs.]

Pertaining to, or evincing, orthodoxy; orthodox.

In an orthodox manner; with soundness of faith. Sir W. Hamilton.

The quality or state of being orthodox; orthodoxy. Waterland.

Soundness of faith; a belief in the doctrines taught in the Scriptures, or in some established standard of faith; -- opposed to heterodoxy or to heresy. Basil himself bears full and clear testimony to Gregory's orthodoxy. Waterland.

Of or pertaining to orthodromy.

The art of sailing in a direct course, or on the arc of a great circle, which is the shortest distance between any two points on the surface of the globe; great-circle sailing; orthodromy.

The act or art of sailing on a great circle.

Of or pertaining to orthoëpy, or correct pronunciation. -- Or`tho*ëp"ic*al*ly, adv.

One who is skilled in orthoëpy.