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semi-ordinate
semi-ordinate n. 
/ˈsɛmɪˌɔːdn̩ət/, /ˈsɛmiˌɔrdn̩ət/ in conic sections.
Brit. /ˈsɛmɪˌɔːdᵻnət/
, /ˈsɛmɪˌɔːdᵻnət//ˈsɛmɪˌɔːdn̩ət/U.S. /ˈsɛˌmaɪˌɔrdn̩ət/
, /ˈsɛˌmaɪˌɔrdn̩ət//ˈsɛmiˌɔrdn̩ət/ΚΠ
1704 J. Harris Lexicon Technicum I Ordinate..a Line in any Conick Section drawn at Right Angles to, and bissected by the Axis, and reaching from one side of the Section to the other; the half of which is properly the Semi-ordinate.
1728 E. Chambers Cycl. at Parabola The Squares of the Semi-ordinates are to each other as the Abscisses.
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