semi-axisn.

Etymology: semi- prefix 2b(b).Previous versions of the OED give the stress as: semi-ˈaxis.

The half of the axis of an ellipse, etc.

ΘΚΠ

the world > relative properties > number > geometry > geometric space > [noun] > division or marking of > axis > half of

semi-axe1728

semi-axis1743

1743 Philos. Trans. 1742–3 (Royal Soc.) 42 360 The Semiaxis of the Spheroid.

1814 J. Playfair Outl. Nat. Philos. II. i. xiv. 215 If a fixed star had an annual parallax that was sensible, it would appear to describe an ellipsis, of which the greater semiaxis was equal to that parallax.

1866 J. F. W. Herschel Familiar Lect. Sci. Subj. v. §40. 213 The period of their mutual circulation may be stated at about ninety-six years, and the semiaxis of their mutual ellipse in angular measure at 4″·8.

1867 W. H. Smyth & E. Belcher Sailor's Word-bk. Mean Distance, the average distance of a planet from the sun; it is equal to half the longer axis of the ellipse, and hence is..termed the semi-axis-major.

This entry has not yet been fully updated (first published 1911; most recently modified version published online June 2019).

单词	semi-axis
释义	semi-axisn. Etymology: semi- prefix 2b(b).Previous versions of the OED give the stress as: semi-ˈaxis. The half of the axis of an ellipse, etc. ΘΚΠ the world > relative properties > number > geometry > geometric space > [noun] > division or marking of > axis > half of semi-axe1728 semi-axis1743 1743 Philos. Trans. 1742–3 (Royal Soc.) 42 360 The Semiaxis of the Spheroid. 1814 J. Playfair Outl. Nat. Philos. II. i. xiv. 215 If a fixed star had an annual parallax that was sensible, it would appear to describe an ellipsis, of which the greater semiaxis was equal to that parallax. 1866 J. F. W. Herschel Familiar Lect. Sci. Subj. v. §40. 213 The period of their mutual circulation may be stated at about ninety-six years, and the semiaxis of their mutual ellipse in angular measure at 4″·8. 1867 W. H. Smyth & E. Belcher Sailor's Word-bk. Mean Distance, the average distance of a planet from the sun; it is equal to half the longer axis of the ellipse, and hence is..termed the semi-axis-major. This entry has not yet been fully updated (first published 1911; most recently modified version published online June 2019). < n.1743
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