QUADRILLION

[qua.dril.lion] n [F, fr. MF, fr. quadri- + -illion (as in million)] (1674): the figure 1 followed by 15 zeroes: the figure 1,000 followed by four groups of three zeroes; also, Brit: the figure 1 followed by 24 zeroes: one million to the fouth power -- quadrillion adj -- qua.dril.lionth adj or n