centroid

[sen-troid]

cen·troid

[sen-troid]
noun
1.
Mechanics. the point that may be considered as the center of a one- or two-dimensional figure, the sum of the displacements of all points in the figure from such a point being zero. Compare center of mass.
2.
Also called median point. Geometry. that point where the medians of a triangle intersect.

Origin:
1875–80; centr- + -oid

cen·troi·dal, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Centroid is always a great word to know.
So is quincunx. Does it mean:
a scrap or morsel of food left at a meal.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
Collins
World English Dictionary
centroid (ˈsɛntrɔɪd)
 
n
a.  the centre of mass of an object of uniform density, esp of a geometric figure
 b.  (of a finite set) the point whose coordinates are the mean values of the coordinates of the points of the set

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