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.
Also called median point. Geometry. that point where the medians of a triangle intersect.

1875–80; centr- + -oid

centroidal, adjective
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World English Dictionary
centroid (ˈsɛntrɔɪd)
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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Example sentences
Each polygon has a uniquely identified centroid, which is a point located anywhere within the area.
Differently from non-fires, the centroid and size of the high temperature cluster are highly time dependent.
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