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the point of intersection of any two altitudes of a triangle


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  • Orthocephalic

    [awr-thoh-suh-fal-ik] /ˌɔr θoʊ səˈfæl ɪk/ adjective, Cephalometry. 1. having a medium or intermediate relation between the height of the skull and the breadth or length. /ˌɔːθəʊsɪˈfælɪk/ adjective 1. having a skull whose breadth is between 70 and 75 per cent of its length

  • Orthochorea

    orthochorea or·tho·cho·re·a (ôr’thō-kô-rē’ə, -kə-) n. A form of chorea in which the spasms occur chiefly when the patient is in an erect posture.

  • Orthochromatic

    [awr-thuh-kroh-mat-ik, -thoh-kruh-] /ˌɔr θə kroʊˈmæt ɪk, -θoʊ krə-/ adjective, Photography. 1. representing correctly the relations of colors as found in a subject; isochromatic. 2. (of an emulsion) sensitive to all visible colors except red; isochromatic. /ˌɔːθəʊkrəʊˈmætɪk/ adjective 1. (photog) of or relating to an emulsion giving a rendering of relative light intensities of different colours […]

  • Orthoclase

    [awr-thuh-kleys, -kleyz] /ˈɔr θəˌkleɪs, -ˌkleɪz/ noun 1. a common white or pink mineral of the feldspar group, KAlSi 3 O 8 , having two good cleavages at right angles, and found in silica-rich igneous rocks: used in the manufacture of porcelain. /ˈɔːθəʊˌkleɪs; -ˌkleɪz/ noun 1. a white to pale yellow, red, or green mineral of […]

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