† mesionn.

Origin: A borrowing from Greek. Etymon: Greek μέσον.

Etymology: < ancient Greek μέσον (see meson n.²), with insertion of -i- after mesial adj. Compare mesio- comb. form and later meson n.² N.E.D. (1906) gives the pronunciation as mī·siǫ̆n, me·siǫ̆n /ˈmiːzɪən/ /ˈmɛsɪən/.

Anatomy. Obsolete. rare.

The median plane of the body. Cf. meson n.²

ΘΚΠ

the world > life > the body > positions or directions in body > [noun] > axis of body > specific

mesion1803

parasternal line1870

transverse axis1878

meson1881

1803 J. Barclay New Anat. Nomencl. 121 Suppose a plane, to pass along the middle of the neck, the mediastinum, and linea alba, and to dividing [sic] the neck and the trunk into similar halves..and let this plane be denominated Mesion.

1881 Science 19 Mar. 124/2 Dr. Barclay proposed mesion, and mesial has been generally used.

This entry has been updated (OED Third Edition, September 2001; most recently modified version published online March 2019).

单词	mesion
释义	† mesionn. Origin: A borrowing from Greek. Etymon: Greek μέσον. Etymology: < ancient Greek μέσον (see meson n.²), with insertion of -i- after mesial adj. Compare mesio- comb. form and later meson n.² N.E.D. (1906) gives the pronunciation as mī·siǫ̆n, me·siǫ̆n /ˈmiːzɪən/ /ˈmɛsɪən/. Anatomy. Obsolete. rare. The median plane of the body. Cf. meson n.² ΘΚΠ the world > life > the body > positions or directions in body > [noun] > axis of body > specific mesion1803 parasternal line1870 transverse axis1878 meson1881 1803 J. Barclay New Anat. Nomencl. 121 Suppose a plane, to pass along the middle of the neck, the mediastinum, and linea alba, and to dividing [sic] the neck and the trunk into similar halves..and let this plane be denominated Mesion. 1881 Science 19 Mar. 124/2 Dr. Barclay proposed mesion, and mesial has been generally used. This entry has been updated (OED Third Edition, September 2001; most recently modified version published online March 2019). < n.1803
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