CONE OF SILENCE: the field of a distorter that limits the carrying power of the voice or any other vibrator by damping the vibrations with an image-vibration 180 degrees out of phase.
CORIOLIS STORM: any major sandstorm on Arrakis where winds across the open flatlands are amplified by the planet's own revolutionary motion to reach speeds up to 700 kilometers per hour.
CORRIN, BATTLE OF: the space battle from which the Imperial House Corrino took its name. The battle fought near Sigma Draconis in the year 88 B.G. settled the ascendancy of the ruling House from Salusa Secundus.
COUSINES: blood relations beyond cousins.
CRUSHERS: military space vessels composed of many smaller vessels locked together and designed to fall on an enemy position, crushing it.
CUTTERAY: short-range version of lasgun used mostly as a cutting tool and surgeon's scalpel.
CRYSKNIFE: the sacred knife of the Fremen on Arrakis. It is manufactured in two forms from teeth taken from dead sandworms. The two forms are "fixed" and
"unfixed." An unfixed knife requires proximity to a human body's electrical field to prevent disintegration. Fixed knives are treated for storage. All are about 20 centimeters long.
DAR AL-HIKMAN: school of religious translation or interpretation.
DARK THINGS: idiomatic for the infectious superstitions taught by the Missionaria Protectiva to susceptible civilizations.
DEATH TRIPOD: originally; the tripod upon which desert executioners hanged their victims. By usage: the three members of a Cherem sworn to the same revenge.
DERCH: right turn; a worm steersman's call.
DEW COLLECTORS or DEW PRECIPITATORS: not to be confused with dew gatherers.
Collectors or precipitators are egg-shaped devices about four centimeters on the long axis. They are made of chromoplastic that turns a reflecting white when subjected to light, and reverts to transparency in darkness. The collector forms a markedly cold surface upon which dawn dew will precipitate. They are used by Fremen to line concave planting depressions where they provide a small but reliable source of water.
DEW GATHERERS: workers who reap dew from the plants of Arrakis, using a scythelike dew reaper.
DEMIBROTHERS: sons of concubines in the same household and certified as having the same father.
DICTUM FAMILIA: that rule of the Great Convention which prohibits the slaying of a royal person or member of a Great House by informal treachery. The rule sets up the formal outline and limits the means of assassination.
DISTRANS: a device for producing a temporary neural imprint on the nervous system of Chiroptera or birds. The creature's normal cry then carries the message imprint which can be sorted from that carrier wave by another distrans.
DRUM SAND: impaction of sand in such away that any sudden blow against its surface produces a distinct drum sound.
DOORSEAL: a portable plastic hermetic seal used for moisture security in Fremen overday cave camps.
DUMP BOXES: the general term for any cargo container of irregular shape and equipped with ablation surfaces and suspensor damping system. They are used to dump material from space onto a planet's surface.
DUNE MEN: idiomatic for open sand workers, spice hunters and the like on Arrakis. Sandworkers. Spiceworkers.
DUST CHASM: any deep crevasse or depression on the desert of Arrakis that has been filled with dust not apparently different from the surrounding surface; a deadly trap because human or animal will sink in it and smother. (See Tidal Dust Basin.)
ECAZ: fourth planet of Alpha Centauri B; the sculptors' paradise, so called because it is the home of fogwood, the plant growth capable of being shaped in situ solely by the power of human thought.
EGO-LIKENESS: portraiture reproduced through a shigawire projector that is capable of reproducing subtle movements said to convey the ego essence.
ELACCA DRUG: narcotic formed by burning blood-grained elacca wood of Ecas. Its effect is to remove most of the will to self-preservation. Druggee skin shows a characteristic carrot color. Commonly used to prepare slave gladiators for the ring.
EL-SAYAL: the "rain of sand." A fall of dust which has been carried to medium altitude (around 2,000 meters) by a coriolis storm. El-sayals frequently bring moisture to ground level.
ERG: an extensive dune area, a sea of sand.
FAI: the water tribute, chief specie of tax on Arrakis.
FANMETAL: metal formed by the growing of jasmium crystals in duraluminum; noted for extreme tensile strength in relationship to weight. Name derives from its common use in collapsible structures that are opened by "fanning" them out.
FAUFRELUCHES; the rigid rule of class distinction enforced by the Imperium. "A place for every man and every man in his place."
FEDAYKIN: Fremen death commandos; historically: a group formed and pledged to give their lives to right a wrong.
FILMBOOK: any shigawire imprint used in training and carrying a mnemonic pulse.
FILT-PLUG: a nose filter unit worn with a stillsuit to capture moisture from the exhaled breath.
FIQH: knowledge, religious law; one of the half-legendary origins of the Zensunni Wanderers' religion.
FIRE, PILLAR OF: a simple pyrocket for signaling across the open desert.
FIRST MOON: the major satellite of Arrakis, first to rise in the night; notable for a distinct human fist pattern on its surface.
FREE TRADERS: idiomatic for smugglers.
FREMEN: the free tribes of Arrakis, dwellers in the desert, remnants of the Zensunni Wanderers. ("Sand Pirates" according to the Imperial Dictionary.) FREMKIT: desert survival kit of Fremen manufacture.
FRIGATE: largest spaceship that can be grounded on a planet and taken off in one piece.
