figurate number: Meaning and Definition of

fig'u•rate num"ber

Pronunciation: (fig'yur-it), [key]
— Math. Math.
  1. a number having the property that the same number of equally spaced dots can be arranged in the shape of a regular geometrical figure.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.