septagonn.adj.

Brit.

/ˈsɛptəɡ(ə)n/, U.S.

/ˈsɛptəˌɡɑn/

Origin: A borrowing from Latin. Etymon: Latin septagōnus.

Etymology: < classical Latin septagōnus heptagonal (in texts on land surveying) < septem seven (see septem- comb. form) + ancient Greek -γωνος -gon comb. form. Compare earlier heptagon n., heptagonal adj.

A. n.

A plane figure with seven angles and seven straight sides; a heptagon. Also: a building or object of heptagonal form or cross-section. Now somewhat rare.Cf. septangle n.

ΘΚΠ

the world > relative properties > number > geometry > shape or figure > [noun] > two-dimensional > heptagon

septangle1551

heptagon1570

septagon1616

1616 A. Rathborne Surveyor i. i. sig. B6^v The figure..C. is called a Septagon, because it is contained vnder seuen sides.

1690 Jrnl. Late Motions & Actions of Confederate Forces 21 The Fortification thereof is a Septagon, with Out-works, answerable to every Bastion.

1738 B. Langley Builder's Compl. Assistant iii. iv. 89 In the Circle K is a Pentagon, in L a Hexagon, in M a Septagon.

1840 S. Wilderspin Syst. Educ. Young ii. 42 The children to be taught to build triangular pillars, oblong pillars, pentagons, hexagons, septagons, octagons, nonagons, and decagons.

1935 I. P. Snelgrove Pract. & Appreciation of Design (ed. 2) iv. 54 Rings of septagons surround the center, similar to the rosette developed on the pentagon plan.

2017 T. J. Zager Becoming Math Teacher you wish you had vii. 167 Now students realized they could make a range of polygons that would fit these criteria, including irregular pentagons, septagons, nonagons, and so forth.

B. adj.

Having seven angles and seven straight sides; heptagonal. Also: heptagonal in form or cross-section. rare.Cf. septangular adj., septangled adj. at septangle n. Derivatives.

ΘΚΠ

the world > space > shape > angularity > specific angular shape > [adjective] > polygonal > heptagonal

heptagonal1612

septilateral1650

septangular1656

septangled1702

heptangular1706

septagon1756

the world > relative properties > number > geometry > shape or figure > [adjective] > two-dimensional > heptagonal

heptagonal1612

septilateral1650

septangular1656

heptahedrical1658

septangled1702

heptangular1706

septagon1756

heptahedral1758

1756 T. Amory Life John Buncle I. 201 Making it [sc. basalt] into pentagon, hexagon, and septagon columns.

1896 Blackwood's Edinb. Mag. Apr. 597 The rock itself..cut into septagon shape.

1905 A. S. Levetus Imperial Vienna iv. 60 The septagon tower—a very rare form of building, and an original one in Vienna—has a cupola-formed roof.

1990 M. Gentle Rats & Gargoyles viii. 344 They made a kind of irregular septagon shape, the skull and lower jaw-bone crowning it.

This entry has been updated (OED Third Edition, September 2020; most recently modified version published online March 2022).

单词	septagon
释义	septagonn.adj. Brit. /ˈsɛptəɡ(ə)n/, U.S. /ˈsɛptəˌɡɑn/ Origin: A borrowing from Latin. Etymon: Latin septagōnus. Etymology: < classical Latin septagōnus heptagonal (in texts on land surveying) < septem seven (see septem- comb. form) + ancient Greek -γωνος -gon comb. form. Compare earlier heptagon n., heptagonal adj. A. n. A plane figure with seven angles and seven straight sides; a heptagon. Also: a building or object of heptagonal form or cross-section. Now somewhat rare.Cf. septangle n. ΘΚΠ the world > relative properties > number > geometry > shape or figure > [noun] > two-dimensional > heptagon septangle1551 heptagon1570 septagon1616 1616 A. Rathborne Surveyor i. i. sig. B6^v The figure..C. is called a Septagon, because it is contained vnder seuen sides. 1690 Jrnl. Late Motions & Actions of Confederate Forces 21 The Fortification thereof is a Septagon, with Out-works, answerable to every Bastion. 1738 B. Langley Builder's Compl. Assistant iii. iv. 89 In the Circle K is a Pentagon, in L a Hexagon, in M a Septagon. 1840 S. Wilderspin Syst. Educ. Young ii. 42 The children to be taught to build triangular pillars, oblong pillars, pentagons, hexagons, septagons, octagons, nonagons, and decagons. 1935 I. P. Snelgrove Pract. & Appreciation of Design (ed. 2) iv. 54 Rings of septagons surround the center, similar to the rosette developed on the pentagon plan. 2017 T. J. Zager Becoming Math Teacher you wish you had vii. 167 Now students realized they could make a range of polygons that would fit these criteria, including irregular pentagons, septagons, nonagons, and so forth. B. adj. Having seven angles and seven straight sides; heptagonal. Also: heptagonal in form or cross-section. rare.Cf. septangular adj., septangled adj. at septangle n. Derivatives. ΘΚΠ the world > space > shape > angularity > specific angular shape > [adjective] > polygonal > heptagonal heptagonal1612 septilateral1650 septangular1656 septangled1702 heptangular1706 septagon1756 the world > relative properties > number > geometry > shape or figure > [adjective] > two-dimensional > heptagonal heptagonal1612 septilateral1650 septangular1656 heptahedrical1658 septangled1702 heptangular1706 septagon1756 heptahedral1758 1756 T. Amory Life John Buncle I. 201 Making it [sc. basalt] into pentagon, hexagon, and septagon columns. 1896 Blackwood's Edinb. Mag. Apr. 597 The rock itself..cut into septagon shape. 1905 A. S. Levetus Imperial Vienna iv. 60 The septagon tower—a very rare form of building, and an original one in Vienna—has a cupola-formed roof. 1990 M. Gentle Rats & Gargoyles viii. 344 They made a kind of irregular septagon shape, the skull and lower jaw-bone crowning it. This entry has been updated (OED Third Edition, September 2020; most recently modified version published online March 2022). < n.adj.1616
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