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See Duck mole, under Duck.

An order of extinct flying reptiles; -- called also Pterosauria.

in structure (especially with regard to the pelvis) between reptiles and birds. -- Or`ni*tho*scel"i*dan, a.

Observation of birds and their habits. [R.] De Quincey.

Of or pertaining to ornithotomy.

One who is skilled in ornithotomy.

The anatomy or dissection of birds.

A combining form signifying straight, right, upright, correct, regular; as, orthodromy, orthodiagonal, orthodox, orthographic.

Designating a complex ether, C.(OC2H5)4, which is obtained as a liquid of a pleasant ethereal odor by means of chlorpicrin, and is believed to be a derivative of the hypothetical normal carbonic acid, C.(OH)4.

That point in which the three perpendiculars let fall from the angles of a triangle upon the opposite sides, or the sides produced, mutually intersect.

An 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.

rines 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