21-letter words containing d, u, f, s
- peroxydisulfuric acid — persulfuric acid (def 2).
- pseudo-cleft sentence — cleft sentence (def 2).
- purple-fringed orchis — either of two North American orchids (Habenaria psycodes and H. fimbriata) with purple-fringed flowers
- radius of convergence — a positive number so related to a given power series that the power series converges for every number whose absolute value is less than this particular number.
- rutherford scattering — the scattering of an alpha particle through a large angle with respect to the original direction of motion of the particle, caused by an atom (Rutherford atom) with most of the mass and all of the positive electric charge concentrated at a center or nucleus.
- saint-maur-des-fosses — a town in N central France, near Paris, on the Marne River.
- silicon tetrafluoride — a colorless, fuming gas, SiF 4 , used chiefly in the manufacture of fluosilicic acid.
- sing a different tune — a succession of musical sounds forming an air or melody, with or without the harmony accompanying it.
- sovereign wealth fund — an investment fund created using the financial assets of a national government
- surface friction drag — the part of the drag on a body moving through a fluid that is dependent on the nature of the surface of the body
- surface-to-underwater — (of a missile, message, etc.) traveling from the surface of the earth to a target underwater.
- the san andreas fault — a geological fault in California
- the slough of despond — a state of extreme despondency, depression or degradation
- theater of the absurd — theater in which standard or naturalistic conventions of plot, characterization, and thematic structure are ignored or distorted in order to convey the irrational or fictive nature of reality and the essential isolation of humanity in a meaningless world.
- theatre of the absurd — drama in which normal conventions and dramatic structure are ignored or modified in order to present life as irrational or meaningless
- universal disk format — (storage, standard) (UDF) A CD-ROM file system standard that is required for DVD ROMs. UDF is the OSTA's replacement for the ISO 9660 file system used on CD-ROMs, but will be mostly used on DVD. DVD multimedia disks use UDF to contain MPEG audio and video streams. To read DVDs you need a DVD drive, the kernel driver for the drive, MPEG video support, and a UDF driver. DVDs containing both UDF filesystems and ISO 9660 filesystems can be read without UDF support. UDF can also be used by CD-R and CD-RW recorders in packet writing mode.
- universe of discourse — the totality of known or supposed objects and phenomena throughout space; the cosmos; macrocosm.
- university of iceland — (body, education) The Home of Fjolnir.
- what the future holds — If you wonder what the future holds, you wonder what will happen in the future.