pyramidoidn.

Brit.

/pᵻˈramᵻdɔɪd/, U.S.

/pəˈræməˌdɔɪd/

Origin: Formed within English, by derivation; modelled on a Latin lexical item. Etymons: pyramid n., -oid suffix.

Etymology: < pyramid n. + -oid suffix, after post-classical Latin pyramidoides (see quot. 1656; short for schema pyramidoides).Compare:1656 J. Wallis De Sectionibus Conicis Prop. ix. 23, in Operum Math. De Conoide & Pyramidoide Parabolico.

Geometry.

1. A solid figure resembling a pyramid. Now rare.parabolic pyramidoid: see the first element.

ΘΚΠ

the world > relative properties > number > geometry > shape or figure > [noun] > three-dimensional > cone > pyramid

pyramid1570

tetrahedron1570

pyramidate1611

parabolic pyramidoid1704

pyramidoid1704

pyramoid1819

1704 J. Harris Lexicon Technicum I Parabolick Pyramidoid..so named by Dr. Wallis from its Genesis, or Formation, which is as follows. Let all the Squares of the Ordinate Applicates in the Parabola be imagined to be so placed, that the Axe shall pass thro' all their Centres at Right Angles. Then will the Aggregate of these Planes, which he proves before to be Arithmetically proportional (Prop. 9. Wallis Con. Sect.) form the Parabolick Pyramidoid.

1765 J. Ross Instructor's Assistant iv. 346 A stone-cutter has cut a pyramidoid, whole length is 5 feet 10 ¼ Inches, and is 5 feet 6 inches in circumference in the middle, I demand how many solid feet it contains?

1948 Amer. Math. Monthly 55 79 In the figure for a parabolic pyramidoid the base figure has five sides when he wanted to have six.

2000 K. Dowden European Paganism iv. 59 Between a fully iconic representation and leaving the stone unwrought lie various geometrical possibilities—pillars and pyramidoid, for instance.

†2. = parabolic spindle n. at parabolic adj. and n. Compounds. Obsolete. rare.

ΚΠ

1707 J. Ward Young Mathematician's Guide 397 If a Parabola be turned about its Base or greatest Ordinate, it will form a Solid called a Pyramidoid, but most commonly a Parabolick Spindle.

1842 Encycl. Brit. XVIII. 746/2 Pyramidoid, a term which is occasionally employed to denote the parabolic spindle.

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

单词	pyramidoid
释义	pyramidoidn. Brit. /pᵻˈramᵻdɔɪd/, U.S. /pəˈræməˌdɔɪd/ Origin: Formed within English, by derivation; modelled on a Latin lexical item. Etymons: pyramid n., -oid suffix. Etymology: < pyramid n. + -oid suffix, after post-classical Latin pyramidoides (see quot. 1656; short for schema pyramidoides).Compare:1656 J. Wallis De Sectionibus Conicis Prop. ix. 23, in Operum Math. De Conoide & Pyramidoide Parabolico. Geometry. 1. A solid figure resembling a pyramid. Now rare.parabolic pyramidoid: see the first element. ΘΚΠ the world > relative properties > number > geometry > shape or figure > [noun] > three-dimensional > cone > pyramid pyramid1570 tetrahedron1570 pyramidate1611 parabolic pyramidoid1704 pyramidoid1704 pyramoid1819 1704 J. Harris Lexicon Technicum I Parabolick Pyramidoid..so named by Dr. Wallis from its Genesis, or Formation, which is as follows. Let all the Squares of the Ordinate Applicates in the Parabola be imagined to be so placed, that the Axe shall pass thro' all their Centres at Right Angles. Then will the Aggregate of these Planes, which he proves before to be Arithmetically proportional (Prop. 9. Wallis Con. Sect.) form the Parabolick Pyramidoid. 1765 J. Ross Instructor's Assistant iv. 346 A stone-cutter has cut a pyramidoid, whole length is 5 feet 10 ¼ Inches, and is 5 feet 6 inches in circumference in the middle, I demand how many solid feet it contains? 1948 Amer. Math. Monthly 55 79 In the figure for a parabolic pyramidoid the base figure has five sides when he wanted to have six. 2000 K. Dowden European Paganism iv. 59 Between a fully iconic representation and leaving the stone unwrought lie various geometrical possibilities—pillars and pyramidoid, for instance. †2. = parabolic spindle n. at parabolic adj. and n. Compounds. Obsolete. rare. ΚΠ 1707 J. Ward Young Mathematician's Guide 397 If a Parabola be turned about its Base or greatest Ordinate, it will form a Solid called a Pyramidoid, but most commonly a Parabolick Spindle. 1842 Encycl. Brit. XVIII. 746/2 Pyramidoid, a term which is occasionally employed to denote the parabolic spindle. This entry has been updated (OED Third Edition, December 2007; most recently modified version published online March 2022). < n.1704
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