pinacoidn.adj.

Brit.

/ˈpɪnəkɔɪd/, U.S.

/ˈpɪnəˌkɔɪd/

Forms: 1800s– pinacoid, 1800s– pinakoid.

Origin: A borrowing from Greek, combined with an English element. Etymons: Greek πινακ- , πίναξ , -oid suffix.

Etymology: < ancient Greek πινακ-, πίναξ pinax n. + -oid suffix. With the adjective compare earlier pinacoidal adj. and also Portuguese pinacóide (1899).

Crystallography.

A. n.

In a crystal or crystal structure: a plane or face which intersects one of the crystal axes and is parallel to the other two. Also: a crystal form or solid figure containing two such planes or faces parallel to each other.

ΘΚΠ

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

pinacoid1858

macropinacoid1883

1858 J. Nicol Elements Mineral. i. 20 In these prisms the principal axis is supposed to be prolonged indefinitely, or to be unbounded. Where it is very short and the lateral axes infinite, the basal pinacoid is formed, consisting merely of two parallel faces.

1895 N. Story-Maskelyne Crystallogr. vii. §303 The poles of the pinakoids form the angular points of the systematic triangles.

1975 Philos. Trans. (Royal Soc.) A. 280 236 The prisms are apparently rounded, but this is no doubt due to the development of subordinate pinakoids.

1999 I. Kostov & R. I. Kostov Crystal Habits Minerals vii. 347 Apatites from alaskites and alkaline syenites are usually with bipyramidal faces, while those from diorites have a well-developed pinacoid {0001}.

B. adj.

Of the nature of a pinacoid; parallel to the two axes that it does not intersect. Cf. prismatoid adj. 1.

ΚΠ

1895 Philos. Trans. 1894 (Royal Soc.) A. 185 901 A pair of pinacoid faces and faces of the basal plane.

1940 F. F. Grout Kemp's Handbk. Rocks (ed. 6) i. 14 Nepheline commonly forms blocky hexagonal prisms, with basal pinacoid terminations, so that vertical cross sections are rectangular.

1981 Amer. Jrnl. Bot. 68 138 (caption) Situation of the eight Ca ions in the unit-cell near to the frontal pinacoid plane.

1996 Geokhimiia Mineralogiia & Petrologiia 31 29 Factors acting separately on pinacoid and dipyramidal surfaces.

This entry has been updated (OED Third Edition, June 2006; most recently modified version published online March 2022).

单词	pinacoid
释义	pinacoidn.adj. Brit. /ˈpɪnəkɔɪd/, U.S. /ˈpɪnəˌkɔɪd/ Forms: 1800s– pinacoid, 1800s– pinakoid. Origin: A borrowing from Greek, combined with an English element. Etymons: Greek πινακ- , πίναξ , -oid suffix. Etymology: < ancient Greek πινακ-, πίναξ pinax n. + -oid suffix. With the adjective compare earlier pinacoidal adj. and also Portuguese pinacóide (1899). Crystallography. A. n. In a crystal or crystal structure: a plane or face which intersects one of the crystal axes and is parallel to the other two. Also: a crystal form or solid figure containing two such planes or faces parallel to each other. ΘΚΠ the world > matter > chemistry > crystallography (general) > crystal (general) > crystals (other miscellaneous) > [noun] > crystal planes pinacoid1858 macropinacoid1883 1858 J. Nicol Elements Mineral. i. 20 In these prisms the principal axis is supposed to be prolonged indefinitely, or to be unbounded. Where it is very short and the lateral axes infinite, the basal pinacoid is formed, consisting merely of two parallel faces. 1895 N. Story-Maskelyne Crystallogr. vii. §303 The poles of the pinakoids form the angular points of the systematic triangles. 1975 Philos. Trans. (Royal Soc.) A. 280 236 The prisms are apparently rounded, but this is no doubt due to the development of subordinate pinakoids. 1999 I. Kostov & R. I. Kostov Crystal Habits Minerals vii. 347 Apatites from alaskites and alkaline syenites are usually with bipyramidal faces, while those from diorites have a well-developed pinacoid {0001}. B. adj. Of the nature of a pinacoid; parallel to the two axes that it does not intersect. Cf. prismatoid adj. 1. ΚΠ 1895 Philos. Trans. 1894 (Royal Soc.) A. 185 901 A pair of pinacoid faces and faces of the basal plane. 1940 F. F. Grout Kemp's Handbk. Rocks (ed. 6) i. 14 Nepheline commonly forms blocky hexagonal prisms, with basal pinacoid terminations, so that vertical cross sections are rectangular. 1981 Amer. Jrnl. Bot. 68 138 (caption) Situation of the eight Ca ions in the unit-cell near to the frontal pinacoid plane. 1996 Geokhimiia Mineralogiia & Petrologiia 31 29 Factors acting separately on pinacoid and dipyramidal surfaces. This entry has been updated (OED Third Edition, June 2006; most recently modified version published online March 2022). < n.adj.1858
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