polyfold

From poly- +‎ fold.

polyfold (plural polyfolds)

1. (mathematics) A metrizable space together with an equivalence class of sc-smooth structures.

polyfold (not comparable)

1. (physics) Having the same total and azimuthal quantum numbers, similar energy values, but different inner quantum numbers.
   • 1925, Scientific papers of the Bureau of Standards - Volume 19, page 121:

     Each group of lines may be accounted for by transitions of the valence electron between a polyfold level of one type and another polyfold level of the same or different type.

   • 1926, Herbert Treadwell Wade, The New International Year Book, page 557:

     Multiplicities of the energy states of the polyfold spectral terms depend on the valence electrons of the atoms.

   • 1928, Optical society of America - Volume 17, page 84:

     These levels comprise the components of spectral terms which are usually polyfold, but it is sometimes difficult or impossible without Zeeman effects or similar criteria to fix the absolute values of the quantum numbers which define the types

   • 1990, Commentarium Scientificum Internationale Tractans de Re Spectrochimica:

     Sommerfeld invented " inner quantum numbers " to distinguish the levels of polyfold spectral terms.

2. Having multiple parts or aspects.
   • 1938, The Journal of the American College of Proctology, page 14:

     I have tried to remain with the realm of this subject, admitting there are many conditions associated with constipation such as the various types of colitis and allergies, which in itself is a polyfold subject.

   • 1980, Ján Ilavský, & Geologický ústav Dionýza Štúra, Antimónové rudy Československa:

     The rise, of many binary, ternary and perhaps polyfold eutectics, often with the character of independent minerals was proved by experience.

   • 2012, Tim Stump, Le Dernier Tour D'ivoire ~ Three Seasons Quick and Collected Poetry, →ISBN:

     While it dimmed the consciousness of the drained victim, the blood was collecting for scientific use, hospital, experimental, and status recording of said character, so that the act would be polyfold punished and as much benefit society.

3. Having multiple folds.
   • 1965, Society of Plastics Engineers., Technical Papers Presented at the Annual National Technical Conference:

     The shape of the polyfold panel surface which has resulted from the strictly technological properties of the material brings about a very characteristic appearance of the areas covered.

   • 1997, Design News - Volume 52, page 363:

     Polyfold air filters provide low resistance and high dust-holding capacity and are for general-purpose filtration in commercial and industrial applications with either permanent, cleanable, or disposable media.