What’s the Plural of Radius? Radii, Radiuses?
The plural of radius is radii or radiuses. Radius is singular.
The plural of radius is radii or radiuses. Radius is singular.
The word and noun matrix originally comes from Latin, and has two accepted plurals: matrixes and matrices (matrices being the original pl. form).
The singular of data is datum. Data is plural, and the more commonly used of the two.
Bacteria is a plural noun, and comes from Latin. Bacterium is singular.
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