orthometricadj.

1854 J. D. Dana Syst. Mineral. (ed. 4) I. 23 In Crystallography there are three axes employed,..and these axes are either at right angles with one another, producing orthometric forms, or oblique, producing clinometric forms.

1883 Encycl. Brit. XVI. 349/2 All crystals may be divided into ‘orthometric’ or erect forms and ‘clinometric’ or inclined forms.

1910 S. G. Burrard Great Trigonometrical Surv. India XIX. vii. 99 Values of height that are derived from the observation of water-flow, have been named ‘dynamic heights’, and values denoting actual vertical distance above sea-level have been called ‘orthometric heights’.

1912 Bull. Amer. Geogr. Soc. 44 265 But as the lines were run up to and over high plateaus in the interior, and down again, it was found that the orthometric correction had to be applied.

1923 D. Clark Plane & Geodetic Surv. II. v. 205 A line of constant orthometric elevation is parallel to the mean sea level surface.

1974 Encycl. Brit. Macropædia XVII. 832/2 To correct these distortions, orthometric corrections..must be applied to long lines of levels at high altitudes that have a north–south trend.

1989 Science 16 June 1339/2 Because we are considering only changes of elevation difference, the distinction between orthometric and ellipsoidal heights is irrelevant.

1952 G. Bomford Geodesy iv. 155 If no error of observation is made, Bb and aA will be measured orthometrically.