A system for symbolic mathematics, especially General Relativity, written by A. Krasinski of Warsaw in the early 1980s.
[awr-thuh-sen-ter] /ˈɔr θəˌsɛn tər/ noun, Geometry. 1. the point of intersection of the three altitudes of a triangle.
/ˈɔːθəʊˌsɛntə/ noun 1. the point of intersection of any two altitudes of a triangle
[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 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.