tre-

From a form of Latin trēs (“three”) used in trēdecim (“thirteen”).

tre-

1. Used for forming names of large numbers as the third in the sequence in the Conway–Guy system.
   • 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

Prefixed form of tri (“through”). Its pretonic form tremi- arose under the influence of rem- (“pre-, before”).

tre- (pretonic tremi-)

1. through-

• Middle Irish: tri-, tré-
  • Irish: tré-

• Thurneysen, Rudolf (1940) [1909], D. A. Binchy and Osborn Bergin, transl., A Grammar of Old Irish, Dublin Institute for Advanced Studies, translation of Handbuch des Alt-Irischen (in German), →ISBN, § 856, page 533; reprinted 2017