
1) Center of mass 2) Centre of mass 3) Middle of a mass
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https://www.crosswordclues.com/clue/centroid

In mathematics and physics, the centroid or geometric center of a two-dimensional region is, informally, the point at which a cardboard cut-out of the region could be perfectly balanced on the tip of a pencil, assuming uniform density and a uniform gravitational field. Formally, the centroid of a plane figure or two-dimensional shape is the arithm...
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http://en.wikipedia.org/wiki/Centroid

• (n.) The center of mass, inertia, or gravity of a body or system of bodies.
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http://thinkexist.com/dictionary/meaning/centroid/

Centre point,
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http://www.cryer.co.uk/glossary/c/index.htm

For a triangle, the point of intersection of the medians. For any other shape, the point whose coordinates are the average of the coordinates of the shape's vertices. The centroid is the center of mass of a figure.
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http://www.daviddarling.info/encyclopedia/C/centroid.html

A point whose coordinates are the average of an associated parts dimensions (central point).
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http://www.encyclo.co.uk/local/20870
Cen'troid noun [ Latin
centrum +
-oid .] The center of mass, inertia, or gravity of a body or system of bodies.
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http://www.encyclo.co.uk/webster/C/45

[
n] - point representing the mean position of the matter in a body
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http://www.webdictionary.co.uk/definition.php?query=centroid

The centre of mass of a figure. The centroid of a triangle is the intersection of the medians. The centroid of a curve or irregular surface area are located with calculus.
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https://www.encyclo.co.uk/local/20687

Centre of area.
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https://www.encyclo.co.uk/local/20707
noun the center of mass of an object of uniform density
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https://www.encyclo.co.uk/local/20974

The point in a member at the intersection of two perpendicular axes so located that the moments of the areas on opposite sides of an axis about that axis is zero.
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https://www.encyclo.co.uk/local/21107

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. Cf. center of mass. · Also calledthat point where the medians of a triangle intersect.
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https://www.infoplease.com/dictionary/centroid
No exact match found.