FIGURATE NUMBERS
\fˈɪɡjʊɹˌe͡ɪt nˈʌmbəz], \fˈɪɡjʊɹˌeɪt nˈʌmbəz], \f_ˈɪ_ɡ_j_ʊ_ɹ_ˌeɪ_t n_ˈʌ_m_b_ə_z]\
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(Math.) Such as can be written as fractions in which numerator and denominator are factorials of the same number of factors having unity for a common difference ; the first factor in the denominator is unity, but in the numerator it may be any number whatever ; 7.8.9 /1.2.3 = 84, which is a F. N. See Factorial.
By Henry Percy Smith
Word of the day
Snake's-head
- Guinea-hen flower; -- so called in England because its spotted petals resemble the scales of a snake's head.