† pelecoidn.adj.

Forms:

α. 1700s–1800s pelecoides.

β. 1700s–1800s pelecoid, 1800s pelicoid (irregular).

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

Etymology: < ancient Greek πέλεκυς axe, hatchet, in Hellenistic Greek also a geometrical figure resembling the head of a double axe ( < the same Indo-European base as Sanskrit paraśu axe) + -oid suffix.In β form after Latin words in -oides (see -oid suffix). N.E.D. (1904) gives the pronunciation as (pe·lĭkoid) /ˈpɛlᵻkɔɪd/.

Geometry. Obsolete.

A. n.

A figure bounded by a semicircle and two concave quadrants (all having the same radius), which roughly resembles the blade of a battleaxe.

ΘΚΠ

the world > space > shape > curvature > types of curvature > [noun] > thing or part in other curved shapes

heart1446

scutule1592

figure (of) eight1607

parenthesis1608

scallop1609

curvilineal1636

stirrup1684

pelecoid1706

shield1849

pretzel1919

jug handle1955

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

amblygon1570

obliquea1608

triangulate1610

pelecoid1706

leaf1716

oblongitude1739

hexagram1863

polystigm1863

tetragram1863

tetrastigm1863

trigram1882

tetromino1954

tromino1954

tetrabolo1961

Penrose tile1975

1706 Phillips's New World of Words (new ed.) Pelecoides, a Name which some give to a certain Geometrical Figure, that somewhat resembles a Hatchet.

1754 New & Compl. Dict. Arts & Sci. III. 2378/1 Pelecoides, in geometry, a figure in the form of an hatchet: such is the figure B C D A..contained under the two inverted quadrantal arcs A B and C D, and the semi circle B C D. The area of the pelecoides is demonstrated to be equal to the square A C.

1855 J. Ogilvie Suppl. Imperial Dict. Pelecoid, a mathematical figure in the form of a hatchet, contained under two quadrantal arcs, and a semicircle. [Also in later dictionaries.]

B. adj.

Hatchet-shaped; of or relating to a pelecoid.

ΘΚΠ

the world > space > shape > curvature > types of curvature > [adjective] > having other specific curved shape

enharpeda1529

roach-bent1575

imbricate1656

pelecoid1728

pear-shaped1731

sabre-shaped1796

fiddle-shaped1819

jug handle1846

round-shouldered1849

figure-six1851

lyriform1857

strigiliform1873

1728 E. Chambers Cycl. at Angle Pelecoid Angle,..is that in figure of a Hatchet.

This entry has been updated (OED Third Edition, September 2005; most recently modified version published online March 2022).

单词	pelecoid
释义	† pelecoidn.adj. Forms: α. 1700s–1800s pelecoides. β. 1700s–1800s pelecoid, 1800s pelicoid (irregular). Origin: A borrowing from Greek, combined with an English element. Etymons: Greek πέλεκυς , -oid suffix. Etymology: < ancient Greek πέλεκυς axe, hatchet, in Hellenistic Greek also a geometrical figure resembling the head of a double axe ( < the same Indo-European base as Sanskrit paraśu axe) + -oid suffix.In β form after Latin words in -oides (see -oid suffix). N.E.D. (1904) gives the pronunciation as (pe·lĭkoid) /ˈpɛlᵻkɔɪd/. Geometry. Obsolete. A. n. A figure bounded by a semicircle and two concave quadrants (all having the same radius), which roughly resembles the blade of a battleaxe. ΘΚΠ the world > space > shape > curvature > types of curvature > [noun] > thing or part in other curved shapes heart1446 scutule1592 figure (of) eight1607 parenthesis1608 scallop1609 curvilineal1636 stirrup1684 pelecoid1706 shield1849 pretzel1919 jug handle1955 the world > relative properties > number > geometry > shape or figure > [noun] > two-dimensional > other amblygon1570 obliquea1608 triangulate1610 pelecoid1706 leaf1716 oblongitude1739 hexagram1863 polystigm1863 tetragram1863 tetrastigm1863 trigram1882 tetromino1954 tromino1954 tetrabolo1961 Penrose tile1975 1706 Phillips's New World of Words (new ed.) Pelecoides, a Name which some give to a certain Geometrical Figure, that somewhat resembles a Hatchet. 1754 New & Compl. Dict. Arts & Sci. III. 2378/1 Pelecoides, in geometry, a figure in the form of an hatchet: such is the figure B C D A..contained under the two inverted quadrantal arcs A B and C D, and the semi circle B C D. The area of the pelecoides is demonstrated to be equal to the square A C. 1855 J. Ogilvie Suppl. Imperial Dict. Pelecoid, a mathematical figure in the form of a hatchet, contained under two quadrantal arcs, and a semicircle. [Also in later dictionaries.] B. adj. Hatchet-shaped; of or relating to a pelecoid. ΘΚΠ the world > space > shape > curvature > types of curvature > [adjective] > having other specific curved shape enharpeda1529 roach-bent1575 imbricate1656 pelecoid1728 pear-shaped1731 sabre-shaped1796 fiddle-shaped1819 jug handle1846 round-shouldered1849 figure-six1851 lyriform1857 strigiliform1873 1728 E. Chambers Cycl. at Angle Pelecoid Angle,..is that in figure of a Hatchet. This entry has been updated (OED Third Edition, September 2005; most recently modified version published online March 2022). < n.adj.1706
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