pos>pref. [ Gr.
☞ In the graphic representation of the benzene nucleus (see
a. [ Ortho- + carbonic. ] (Chem.) Designating a complex ether,
n. [ Ortho- + center. ] (Geom.) 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. [ 1913 Webster ]
‖n. [ NL., fr. Gr.
n. [ Ortho- + Gr. &unr_;, &unr_;, a horn. ] (Zool.) An orthoceras; also, any fossil shell allied to Orthoceras. [ 1913 Webster ]
n. [ Ortho- + Gr. &unr_; to break. ] (Min.) Common or potash feldspar crystallizing in the monoclinic system and having two cleavages at right angles to each other. See Feldspar. [ 1913 Webster ]
a. (Crystallog.) Breaking in directions at right angles to each other; -- said of the monoclinic feldspars. [ 1913 Webster ]
n. [ Ortho- + diagonal. ] (Crystallog.) The diagonal or lateral axis in a monoclinic crystal which is at right angles with the vertical axis. [ 1913 Webster ]
n. [ Ortho- + dome. ] (Crystallog.) See the Note under Dome, 4. [ 1913 Webster ]
n. (Med.) The treatment of the teeth so as to make the teeth align properly within the mouth, usually involving the wearing of braces and sometimes oral surgery. [ PJC ]