strophoidn.
/ˈstrɒfɔɪd/ Geometry.
(See quot. 1880.)
ΘΚΠ
the world > relative properties > number > geometry > curve > [noun] > locus
locus1675
evolute1704
place1704
trajectory1795
syntractory1820
focal surface1828
synharmonic1850
syntractrix1852
pedal1862
umbilical focal conic1862
umbilical focal conic1862
stigmatic1863
synchronism1867
synchronous curve1867
Steinerian1873
tac-locus1873
strophoid1880
orthoptic locus1882
strophoidal1908
hypercycle1909
the world > relative properties > number > geometry > curve > [adjective] > of or relating to locus
inceptive1706
pedal1862
strophoid1880
strophoidal1908
1880 W. W. Johnson in Amer. Jrnl. Math. 3 320 The term Strophoid has been applied by French writers to a cubic curve, of which the symmetrical form has been discussed by Dr. James Booth under the name of the Logocyclic Curve... I have ventured to use the word in a more extended signification, and define the strophoid as the locus of the intersection of two straight lines which rotate uniformly about two fixed points in a plane.
1883 E. Barnes in Johns Hopkins Univ. Circular 2 145 A Note on the Strophoids.
1908 Royal Soc. Catal. Sci. Papers, Subj. Index I. 535/1 Strophoid [several refs. to foreign periodicals].
1908 Royal Soc. Catal. Sci. Papers, Subj. Index I. 631/2 Logocyclic curve..or strophoid.
Derivatives
stroˈphoidal adj. and n.
ΘΚΠ
the world > relative properties > number > geometry > curve > [noun] > locus
locus1675
evolute1704
place1704
trajectory1795
syntractory1820
focal surface1828
synharmonic1850
syntractrix1852
pedal1862
umbilical focal conic1862
umbilical focal conic1862
stigmatic1863
synchronism1867
synchronous curve1867
Steinerian1873
tac-locus1873
strophoid1880
orthoptic locus1882
strophoidal1908
hypercycle1909
the world > relative properties > number > geometry > curve > [adjective] > of or relating to locus
inceptive1706
pedal1862
strophoid1880
strophoidal1908
1908 Royal Soc. Catal. Sci. Papers, Subj. Index I. 535/2 Strophoidal curves of 3rd degree.
1908 Royal Soc. Catal. Sci. Papers, Subj. Index I. 632/2 Strophoidals.
This entry has not yet been fully updated (first published 1919; most recently modified version published online June 2018).
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n.1880