| orthocarbonic | <chemistry> Designating a complex ether, C.(OC2H5)4, which is obtained as a liquid of a pleasant ethereal odour by means of chlorpicrin, and is believed to be a derivative of the hypothetical normal carbonic acid, C.(OH)4. Origin: Ortho- + carbonic. Source: Websters Dictionary (01 Mar 1998) |
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| orthocenter | <geometry> 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. Origin: Ortho- + center. Source: Websters Dictionary (01 Mar 1998) |
| orthocephalic | Having a head well proportioned to height; denoting a skull with a vertical index between 70 and 75. See: metriocephalic. Synonym: orthocephalous. Origin: ortho-+ G. Kephale, head (05 Mar 2000) |
| orthocephalous | Having a head well proportioned to height; denoting a skull with a vertical index between 70 and 75. See: metriocephalic. Synonym: orthocephalous. Origin: ortho-+ G. Kephale, head (05 Mar 2000) |
| orthoceras | <paleontology> An extinct genus of Paleozoic Cephalopoda, having a long, straight, conical shell. The interior is divided into numerous chambers by transverse septa. Origin: NL, fr. Gr. Straight + a horn. Source: Websters Dictionary (01 Mar 1998) |
| orthoceratite | <zoology> An orthoceras; also, any fossil shell allied to Orthoceras. Origin: Ortho- + Gr, a horn. Source: Websters Dictionary (01 Mar 1998) |
| orthochorea | A form of chorea in which the spasms occur only or chiefly when the patient is in the erect posture. (05 Mar 2000) |
| orthochromatic | Denoting any tissue or cell that stains the colour of the dye used, i.e., the same colour as the dye solution with which it is stained. Synonym: euchromatic, orthochromophil, orthochromophile. Origin: ortho-+ G. Chroma, colour (05 Mar 2000) |
| orthochromophil | Orthochromophile Synonym: orthochromatic. Origin: ortho-+ G. Chroma, colour, + philos, fond (05 Mar 2000) |
| orthoclase | <chemical> Common or potash feldspar crystallizing in the monoclinic system and having two cleavages at right angles to each other. See Feldspar. Origin: Ortho- + Gr. To break. Source: Websters Dictionary (01 Mar 1998) |
| orthoclastic | <chemistry> Breaking in directions at right angles to each other; said of the monoclinic feldspars. Source: Websters Dictionary (01 Mar 1998) |
| orthocrasia | An obsolete term for condition in which there is a normal reaction to drugs, articles of diet, etc. Origin: ortho-+ G. Krasis, a mixing, temperament (05 Mar 2000) |
| orthocytosis | A condition in which all of the cellular elements in the circulating blood are mature forms, irrespective of the proportions of various types and total numbers. Origin: ortho-+ G. Kytos, cell, + -osis, condition (05 Mar 2000) |
| orthodentin | Straight tubed dentin as seen in the teeth of mammals. (05 Mar 2000) |
| orthodeoxia | Fall in arterial blood oxygen upon assuming the upright posture. Usually due to right-to-left cardiac or vascular shunting with a posturally induced fall in left sided pressure permitting a corresponding gradient across the shunt. (05 Mar 2000) |