21-letter words containing f, e, a, r, l
- the rock of gibraltar — a limestone promontory at the tip of S Spain
- the san andreas fault — a geological fault in California
- to fall into the trap — If someone falls into the trap of doing something, they think or behave in a way which is not wise or sensible.
- to lay down your life — If someone lays down their life for another person, they die so that the other person can live.
- to risk life and limb — If someone risks life and limb, they do something very dangerous that may cause them to die or be seriously injured.
- topgallant forecastle — a partial weather deck on top of a forecastle superstructure; forecastle deck.
- traffic control tower — an elevated structure for the visual observation and control of the air and ground traffic at an airport
- transformational rule — Linguistics. a rule of transformational grammar that relates two phrase markers in the course of a derivation from the deep to the surface syntactic representation of a sentence, as by reordering, inserting, or deleting elements; a rule that converts deep structures into surface structures.
- triethyl orthoformate — a colorless liquid, C 7 H 16 O 3 , used chiefly in organic synthesis.
- universal affirmative — a proposition of the form “All S is P.” Symbol: A, a.
- 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.
- university of iceland — (body, education) The Home of Fjolnir.
- venus's flower basket — a glass sponge of the genus Euplectella, inhabiting deep waters off the Philippines and Japan, having a cylindrical skeleton formed of an intricate latticework of siliceous spicules.
- virginia (rail) fence — a zigzag fence made of rails laid across one another at the ends
- volunteers of america — a religious reform and relief organization, similar to the Salvation Army, founded in New York City in 1896 by Ballington Booth, son of William Booth, the founder of the Salvation Army. Abbreviation: VOA.
- warm silence software — A small company run by(?) Robin Watts, producing software for the Acorn Archimedes.
- weak head normal form — (reduction, theory) (WHNF) A lambda expression is in weak head normal form (WHNF) if it is a head normal form (HNF) or any lambda abstraction. I.e. the top level is not a redex. The term was coined by Simon Peyton Jones to make explicit the difference between head normal form (HNF) and what graph reduction systems produce in practice. A lambda abstraction with a reducible body, e.g. \ x . ((\ y . y+x) 2) is in WHNF but not HNF. To reduce this expression to HNF would require reduction of the lambda body: (\ y . y+x) 2 --> 2+x Reduction to WHNF avoids the name capture problem with its need for alpha conversion of an inner lambda abstraction and so is preferred in practical graph reduction systems. The same principle is often used in strict languages such as Scheme to provide call-by-name evaluation by wrapping an expression in a lambda abstraction with no arguments: D = delay E = \ () . E The value of the expression is obtained by applying it to the empty argument list:
- what the future holds — If you wonder what the future holds, you wonder what will happen in the future.
- wildlife photographer — someone that specializes in taking photographs of wild animals, especially in their natural habitats, and plants
- william of malmesbury — William of, William of Malmesbury.
- xilinx netlist format — (language, electronics) (XNF) A Hardware Description Language for electronic circuit design, developed by Xilinx, Inc..