pedionn.

Brit.

/ˈpɛdɪən/,

/ˈpiːdɪən/, U.S.

/ˈpɛdiən/,

/ˈpidiən/

Inflections: Plural pedia, pedions.

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

Etymology: < ancient Greek πεδίον a plain, a flat surface < πέδον ground, earth (see pedo- comb. form²) + -ιον , suffix forming nouns (compare -y suffix⁴). N.E.D. (1904) gives the pronunciation as (pe·diǫn) /ˈpɛdɪɒn/.

Crystallography.

A crystal form, shown by triclinic minerals, consisting of a single face bounded by other faces having no simple symmetrical relation to it (or to each other).

ΘΚΠ

the world > matter > chemistry > crystallography (general) > crystal (general) > crystals (other miscellaneous) > [noun] > crystal faces

plane1671

hemiprism1864

hemidome1868

pedion1899

1899 W. J. Lewis Treat. Crystallogr. xi. 148 Each form consists of a single face, and will be called a pedion.

1959 C. S. Hurlbut Dana's Man. Mineral. (ed. 17) 104 The stereogram..shows only one pole, that of the pedion.

2002 Thin Solid Films 406 118 The crystal habits were found to be dominated by slow-growing pyramidal and pedion facets.

This entry has been updated (OED Third Edition, September 2005; most recently modified version published online March 2022).

单词	pedion
释义	pedionn. Brit. /ˈpɛdɪən/, /ˈpiːdɪən/, U.S. /ˈpɛdiən/, /ˈpidiən/ Inflections: Plural pedia, pedions. Origin: A borrowing from Greek. Etymon: Greek πεδίον. Etymology: < ancient Greek πεδίον a plain, a flat surface < πέδον ground, earth (see pedo- comb. form²) + -ιον , suffix forming nouns (compare -y suffix⁴). N.E.D. (1904) gives the pronunciation as (pe·diǫn) /ˈpɛdɪɒn/. Crystallography. A crystal form, shown by triclinic minerals, consisting of a single face bounded by other faces having no simple symmetrical relation to it (or to each other). ΘΚΠ the world > matter > chemistry > crystallography (general) > crystal (general) > crystals (other miscellaneous) > [noun] > crystal faces plane1671 hemiprism1864 hemidome1868 pedion1899 1899 W. J. Lewis Treat. Crystallogr. xi. 148 Each form consists of a single face, and will be called a pedion. 1959 C. S. Hurlbut Dana's Man. Mineral. (ed. 17) 104 The stereogram..shows only one pole, that of the pedion. 2002 Thin Solid Films 406 118 The crystal habits were found to be dominated by slow-growing pyramidal and pedion facets. This entry has been updated (OED Third Edition, September 2005; most recently modified version published online March 2022). < n.1899
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