pyramidionn.

Brit.

/ˌpɪrəˈmɪdɪən/, U.S.

/ˌpɪrəˈmɪdiən/

Inflections: Plural pyramidions, pyramidia.

Origin: A borrowing from Greek. Etymons: Greek πυραμίδ-, πυραμίς, -ιον.

Etymology: < ancient Greek πυραμίδ-, πυραμίς pyramid n. + -ιον, diminutive suffix. Compare French pyramidion (1828 in archaeological use).The formation is apparently not attested in Greek or Latin.

1. Chiefly Architecture and Archaeology. A small pyramid; esp. (a) the pyramidal apex of an obelisk; (b) the capstone of a pyramid.

ΘΚΠ

society > leisure > the arts > visual arts > architecture > pillar > [noun] > others > specific part

pyramidion1738

1738 T. Shaw Trav. Barbary & Levant iv. v. 410 The Pillars..consist of two Parts, the Shaft, and the Pyramidion.

1840 Bonomi in Trans. Royal Soc. Lit. (1843) 2nd Ser. I. 161 The height of the pyramidion should be about a tenth of the whole length.

1877 W. R. Cooper Short Hist. Egypt. Obelisks (1878) i. 2 Its apex is abruptly terminated by a small pyramidion, whose faces are inclined at about an angle of sixty degrees.

1953 Jrnl. Soc. Archit. Historians 12 7 The pyramidion atop the obelisk derives directly from the cult of Atun,..who created the Primeval Hill by ejecting a drop of semen which petrified.

1980 Times Lit. Suppl. 12 Dec. 1422/3 These small pyramids of brick were capped with limestone pyramidia.

2005 D. Cruickshank Around World in 80 Treasures 200 If..the pyramid was a temple to the sun god Re, then the pyramidion marked the dawn of each day for it caught..the first rays of the dawning sun.

†2. Crystallography. N. Story-Maskelyne's term for: a solid figure formed from a polyhedron by erecting a small pyramid on each face of the polyhedron (the faces being the bases of the pyramids); (also) each of the small pyramids so erected. Obsolete. rare.

ΚΠ

1895 N. Story-Maskelyne Crystallogr. §167 Holo-symmetrical forms of this [sc. the cubic] system:... 2. The triakis-octahedron or the octahedrid pyramidion... 4. The tetrakis-hexahedron or the cube-pyramidion..: the term pyramidion being employed in the case of forms in which a pyramidion or small pyramid composed of similar isosceles triangles surmounts every face of a simpler figure.

1895 N. Story-Maskelyne Crystallogr. §172 The figure presents the aspect of a cube each face of which is surmounted by an obtuse pyramid, and it may, on this account, be termed the cube-pyramidion.

This entry has been updated (OED Third Edition, December 2007; most recently modified version published online March 2022).

单词	pyramidion
释义	pyramidionn. Brit. /ˌpɪrəˈmɪdɪən/, U.S. /ˌpɪrəˈmɪdiən/ Inflections: Plural pyramidions, pyramidia. Origin: A borrowing from Greek. Etymons: Greek πυραμίδ-, πυραμίς, -ιον. Etymology: < ancient Greek πυραμίδ-, πυραμίς pyramid n. + -ιον, diminutive suffix. Compare French pyramidion (1828 in archaeological use).The formation is apparently not attested in Greek or Latin. 1. Chiefly Architecture and Archaeology. A small pyramid; esp. (a) the pyramidal apex of an obelisk; (b) the capstone of a pyramid. ΘΚΠ society > leisure > the arts > visual arts > architecture > pillar > [noun] > others > specific part pyramidion1738 1738 T. Shaw Trav. Barbary & Levant iv. v. 410 The Pillars..consist of two Parts, the Shaft, and the Pyramidion. 1840 Bonomi in Trans. Royal Soc. Lit. (1843) 2nd Ser. I. 161 The height of the pyramidion should be about a tenth of the whole length. 1877 W. R. Cooper Short Hist. Egypt. Obelisks (1878) i. 2 Its apex is abruptly terminated by a small pyramidion, whose faces are inclined at about an angle of sixty degrees. 1953 Jrnl. Soc. Archit. Historians 12 7 The pyramidion atop the obelisk derives directly from the cult of Atun,..who created the Primeval Hill by ejecting a drop of semen which petrified. 1980 Times Lit. Suppl. 12 Dec. 1422/3 These small pyramids of brick were capped with limestone pyramidia. 2005 D. Cruickshank Around World in 80 Treasures 200 If..the pyramid was a temple to the sun god Re, then the pyramidion marked the dawn of each day for it caught..the first rays of the dawning sun. †2. Crystallography. N. Story-Maskelyne's term for: a solid figure formed from a polyhedron by erecting a small pyramid on each face of the polyhedron (the faces being the bases of the pyramids); (also) each of the small pyramids so erected. Obsolete. rare. ΚΠ 1895 N. Story-Maskelyne Crystallogr. §167 Holo-symmetrical forms of this [sc. the cubic] system:... 2. The triakis-octahedron or the octahedrid pyramidion... 4. The tetrakis-hexahedron or the cube-pyramidion..: the term pyramidion being employed in the case of forms in which a pyramidion or small pyramid composed of similar isosceles triangles surmounts every face of a simpler figure. 1895 N. Story-Maskelyne Crystallogr. §172 The figure presents the aspect of a cube each face of which is surmounted by an obtuse pyramid, and it may, on this account, be termed the cube-pyramidion. This entry has been updated (OED Third Edition, December 2007; most recently modified version published online March 2022). < n.1738
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