figurate number

[ fig-yer-it ]
/ ˈfɪg yər ɪt /

noun Mathematics.

a number having the property that the same number of equally spaced dots can be arranged in the shape of a regular geometrical figure.

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orchard

Origin of figurate number

First recorded in 1605–15
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020