unoden.
/ˈjuːnəʊd/, U.S. /ˈjuˌnoʊd/ Mathematics. Now rare.
A double point having the property that all the tangents at that point coincide so as to form a single line.
ΘΚΠ
the world > relative properties > number > geometry > point > [noun] > of intersection or contact > of specific lines or curves
cuspis1646
focus1656
point of reflection1674
umbilicus1704
cuspid1743
cusp1758
rhamphoid1814
biplanar1849
oscnode1852
tacnode1852
tangential of a point1858
cnicnode1869
uniplane1869
unode1869
1869 Philos. Trans. (Royal Soc.) 159 234 If there is a unode, then this may be and is taken to be at D, and its uniplane may be taken to be X = 0.
1910 A. B. Basset Treat. Geom. Surfaces 25 The reciprocal polar of a unode is called a unitrope.
2008 L. Evans et al. in P. D. Bons et al. Microdynamics Simulation iii. 81 Unodes may be uniformly or randomly distributed.
This entry has been updated (OED Third Edition, December 2014; most recently modified version published online December 2021).
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n.1869