septen-

From an altered form of Latin septem (“seven”) used in some compounds such as septendecim and septentriō.

septen-

1. Alternative form of septem- (“seven”).
   • 1999 August 30, Clive Tooth, “Could anyone tell me how to say this number?”, in sci.math‎^[1] (Usenet), archived from the original on 30 December 2025:

     five trequinquagintillion, nine hundred fifty eight doquinquagintillion, nine hundred thirty five unquinquagintillion, nine hundred eighty quinquagintillion, three hundred sixty two novemquadragintillion, six hundred forty five octoquadragintillion, eight hundred twenty five septenquadragintillion, one hundred sixteen sexquadragintillion, one hundred five quinquadragintillion, nine hundred forty nine quattuorquadragintillion, forty seven trequadragintillion