| ORTHOCAINE | • orthocaine n. Methyl m-amino-p-hydroxybenzoate, a fine white crystalline powder used as an anesthetic on open wounds. • ORTHOCAINE n. a white crystalline substance used as a local anaesthetic.
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| ORTHOCLASE | • orthoclase n. (Mineralogy) Potassium aluminum silicate, KAlSi3O8, a common feldspar of igneous, plutonic, and metamorphic… • ORTHOCLASE n. common or potash feldspar crystallizing in the monoclinic system and having two cleavages at right angles to each other.
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| ORTHOCAINES | • orthocaines n. Plural of orthocaine. • ORTHOCAINE n. a white crystalline substance used as a local anaesthetic.
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| ORTHOCENTER | • orthocenter n. (Geometry) The intersection of the three lines that can be drawn flowing from the three corners of a… • ORTHOCENTER n. the point of intersection of the altitudes of a triangle, also ORTHOCENTRE.
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| ORTHOCENTRE | • orthocentre n. Alternative form of orthocenter. • ORTHOCENTRE n. the point of intersection of the altitudes of a triangle, also ORTHOCENTER.
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| ORTHOCLASES | • orthoclases n. Plural of orthoclase. • ORTHOCLASE n. common or potash feldspar crystallizing in the monoclinic system and having two cleavages at right angles to each other.
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| ORTHOCENTERS | • orthocenters n. Plural of orthocenter. • ORTHOCENTER n. the point of intersection of the altitudes of a triangle, also ORTHOCENTRE.
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| ORTHOCENTRES | • orthocentres n. Plural of orthocentre. • ORTHOCENTRE n. the point of intersection of the altitudes of a triangle, also ORTHOCENTER.
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| ORTHOCEPHALY | • orthocephaly n. The condition of being orthocephalic. • ORTHOCEPHALY n. the state of being orthocephalic.
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| ORTHOCLASTIC | • orthoclastic adj. (Crystallography) Having cleavage planes at right angles, as in orthoclase. • ORTHOCLASTIC adj. chiefly of feldspar, having cleavages at right angles.
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| ORTHOCOUSINS | • orthocousins n. Plural of orthocousin. • ORTHOCOUSINS n. the children of two brothers or two sisters.
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| ORTHOCEPHALIC | • orthocephalic adj. Normocephalic. • ORTHOCEPHALIC adj. having a skull whose breadth is between 70 and 75 per cent of its length, also ORTHOCEPHALOUS.
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| ORTHOCEPHALIES | • ORTHOCEPHALY n. the state of being orthocephalic. | 
| ORTHOCEPHALOUS | • orthocephalous adj. Alternative form of orthocephalic. • ORTHOCEPHALOUS adj. having a skull whose breadth is between 70 and 75 per cent of its length, also ORTHOCEPHALIC.
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| ORTHOCHROMATIC | • orthochromatic adj. Being uniformly sensitive across the entire visible range, and thus reproducing colours faithfully. • orthochromatic adj. (Photography) Sensitive to all colours except red.
 • ORTHOCHROMATIC adj. of photographic film, sensitive to all colours except red.
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| ORTHOCHROMATISM | • orthochromatism n. Quality of being orthochromatic. • ORTHOCHROMATISM n. the state of being orthochromatic, of photographic film, sensitive to all colours except red.
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