prismoidn.adj.
/ˈprɪzmɔɪd/, U.S. /ˈprɪzˌmɔɪd/ A. n.† 2. Physiology. More fully liquid prismoid, watery prismoid. J. Thomson's name for: a (supposed) collection of fluid in the superior and inferior fornices of the conjunctiva, capable of exerting a refractive effect on light entering the eye. Obsolete. rare.
1. A solid body resembling a prism in form; spec. one with similar but unequal parallel polygonal end faces.
ΘΚΠ
the world > space > shape > angularity > specific angular shape > [noun] > prism > object having form of
prism1660
prismoid1704
the world > relative properties > number > geometry > shape or figure > [noun] > three-dimensional > prism
prism1570
prismoid1704
wedge1723
1704 J. Harris Lexicon Technicum I Prismoid, is a solid Figure, contained under several Planes whose Bases are rectangular Parallelograms, parallel and alike situate.
1743 W. Emerson Doctr. Fluxions 208 Let BF be a Prismoid, whose Bases are right angled Parallelograms, though not similar.
1837 W. Irving Adventures Capt. Bonneville III. iii. 44 In this neighbourhood, he saw..several prismoids of basaltes, rising to the height of fifty or sixty feet.
1870 Eng. Mech. 28 Jan. 489/1 The greater end of a prismoid measures 12 in. by 8.
1934 Geogr. Rev. 24 455 Dimensions of the unit prismoids are determined by measurement on a drawing of a velocity cross section.
1984 W. Schofield Engin. Surveying (ed. 3) I. iii. 54 The prismoid differs from the prism in that its parallel ends are not necessarily equal in area.
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the world > life > the body > sense organ > sight organ > parts of sight organ > [noun] > conjunctiva
conjunctiva1543
conjunctive1633
conjunctive membrane1658
conjunctive tunic1834
prismoid1892
1892 J. Thomson in Proc. Royal Soc. 52 71 The drawing represents a vertical section of the eye, eyelids, and watery prismoids. [Note] The refracting watery liquid in the entrant corner between lip of eyelid and cornea may be called the prismoid or liquid prismoid.
B. adj.
= prismoidal adj. 1. prismoid formula Mathematics. = prismoidal formula n. at prismoidal adj. Compounds.
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the world > space > shape > angularity > specific angular shape > [adjective] > prismatic
prismatical1611
prismatic1668
diamond-cut1703
prismated1816
prismatoidal1821
prismoidal1826
prismoid1840
prismate1858
the world > relative properties > number > geometry > shape or figure > [adjective] > three-dimensional > prismatical or prismoidal
prismatical1654
prismatoidal1821
prismoidal1826
prismoid1840
prismate1858
1840 E. Wilson Anatomist's Vade Mecum 1 The shaft is cylindrical or prismod [sic] in form.
1888 Ann. Math. 4 48 ½(C + C′) − 1/ 6A, the familiar form of the true prismoid formula for the mean area.
1905 Amer. Anthropologist 7 462 The piece in question is a prismoid flint flake.
1924 E. V. Huntington in H. L. Rietz Handbk. Math. Statistics i. 17 If f(x) is a polynomial of the fourth degree, its fourth derivative will be constant, and exact results can be obtained by using the prismoid formula with the correctional term.
1998 Los Angeles Times (Nexis) 29 Oct. f56 Classy in the way only a chain hotel lounge can be:..leathery swivel chairs; dark, floral-print carpet; prismoid crystal chandeliers and brassy railings.
This entry has been updated (OED Third Edition, June 2007; most recently modified version published online March 2022).
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n.adj.1704