Webster's Dictionary, 1913

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Cyanite noun [ See Cyanic .] (Min.) A mineral occuring in thin- bladed crystals and crystalline aggregates, of a sky-blue color. It is a silicate of aluminium. [ Written also kyanite .]

Cyanogen noun [ Greek ky`anos a dark blue substance + -gen : confer French cyanogène . So called because it produced blue dyes.] (Chemistry) A colorless, inflammable, poisonous gas, C 2 N 2 , with a peach-blossom odor, so called from its tendency to form blue compounds; obtained by heating ammonium oxalate, mercuric cyanide, etc. It is obtained in combination, forming an alkaline cyanide when nitrogen or a nitrogenous compound is strongly ignited with carbon and soda or potash. It conducts itself like a member of the halogen group of elements, and shows a tendency to form complex compounds. The name is also applied to the univalent radical, CN (the half molecule of cyanogen proper), which was one of the first compound radicals recognized.

» Cyanogen is found in the commercial substances, potassium cyanide, or prussiate of potash, yellow prussiate of potash, Prussian blue, Turnbull's blue, prussic acid, etc.

Cyanometer noun [ Greek ky`anos a dark blue substance + -meter : confer French cyanomètre .] An instrument for measuring degress of blueness.

Cyanopathy noun [ Greek ky`anos a dark blue substance + pa`qos affection.] (Medicine) A disease in which the body is colored blue in its surface, arising usually from a malformation of the heart, which causes an imperfect arterialization of the blood; blue jaundice.

Cyanophyll noun [ Greek ky`anos a dark blue substance + fy`llon leaf.] (Botany) A blue coloring matter supposed by some to be one of the component parts of chlorophyll.

Cyanosed adjective [ See Cyanic .] Rendered blue, as the surface of the body, from cyanosis or deficient aëration of the blood.

Cyanosis noun [ New Latin See Cyanic .] (Medicine) A condition in which, from insufficient aëration of the blood, the surface of the body becomes blue. See Cyanopathy .

Cyanosite noun [ See Cyanic .] (Min.) Native sulphate of copper. Confer Blue vitriol , under Blue .

Cyanotic adjective (Medicine) Relating to cyanosis; affected with cyanosis; as, a cyanotic patient; having the hue caused by cyanosis; as, a cyanotic skin.

Cyanotype noun [ Cyanide + -type .] A photographic picture obtained by the use of a cyanide.

Cyanurate noun (Chemistry) A salt of cyanuric acid.

Cyanuret noun (Chemistry) A cyanide. [ Obsolete]

Cyanuric adjective [ Cyanic + uric : Confer French cyanurique .] (Chemistry) Pertaining to, or derived from, cyanic and uric acids.

Cyanuric acid (Chemistry) , an organic acid, C 3 O 3 N 3 H 3 , first obtained by heating uric acid or urea , and called pyrouric acid ; afterwards obtained from isocyanic acid . It is a white crystalline substance, odorless and almost tasteless; -- called also tricarbimide .

Cyathiform adjective [ Latin cyathus a cup (Gr, ky`aqos ) - form :cf. F. cyathiforme .] In the form of a cup, a little widened at the top.

Cyatholith noun [ Greek ky`aqos a cup + -lith .] (Biol.) A kind of coccolith, which in shape resembles a minute cup widened at the top, and varies in size from &frac1x6000; to &frac1x8000; of an inch.

Cyathophylloid adjective [ New Latin cyathophyllum , from Greek ky`aqos a cup + fy`llon a leaf.] (Paleon.) Like, or pertaining to, the family Cyathophyllidæ .

Cyathophylloid noun (Paleon.) A fossil coral of the family Cyathophyllidæ ; sometimes extended to fossil corals of other related families belonging to the group Rugosa; -- also called cup corals . Thay are found in paleozoic rocks.

Cycad (sī"kăd) noun (Botany) Any plant of the natural order Cycadaceæ , as the sago palm, etc.

Cycadaceous adjective (Botany) Pertaining to, or resembling, an order of plants like the palms, but having exogenous wood. The sago palm is an example.

Cycas noun [ Of uncertain origin. Linnæus derives it from one of the "obscure Greek words."] (Botany) A genus of trees, intermediate in character between the palms and the pines. The pith of the trunk of some species furnishes a valuable kind of sago.

Cyclamen noun [ New Latin , from Greek kykla`minos , kyklami`s .] (Botany) A genus of plants of the Primrose family, having depressed rounded corms, and pretty nodding flowers with the petals so reflexed as to point upwards, whence it is called rabbits' ears . It is also called sow bread , because hogs are said to eat the corms.

Cyclamin noun A white amorphous substance, regarded as a glucoside, extracted from the corm of Cyclamen Europæum .

Cyclas noun [ Confer Ciclatoun .] A long gown or surcoat (cut off in front), worn in the Middle Ages. It was sometimes embroidered or interwoven with gold. Also, a rich stuff from which the gown was made.

Cycle noun [ French ycle , Late Latin cyclus , from Greek ky`klos ring or circle, cycle; akin to Sanskrit cakra wheel, circle. See Wheel .]
1. An imaginary circle or orbit in the heavens; one of the celestial spheres. Milton.

2. An interval of time in which a certain succession of events or phenomena is completed, and then returns again and again, uniformly and continually in the same order; a periodical space of time marked by the recurrence of something peculiar; as, the cycle of the seasons, or of the year.

Wages . . . bear a full proportion . . . to the medium of provision during the last bad cycle of twenty years.

3. An age; a long period of time.

Better fifty years of Europe than a cycle of Cathay.

4. An orderly list for a given time; a calendar. [ Obsolete]

We . . . present our gardeners with a complete cycle of what is requisite to be done throughout every month of the year.

5. The circle of subjects connected with the exploits of the hero or heroes of some particular period which have served as a popular theme for poetry, as the legend of Arthur and the knights of the Round Table, and that of Charlemagne and his paladins.

6. (Botany) One entire round in a circle or a spire; as, a cycle or set of leaves. Gray.

7. A bicycle or tricycle, or other light velocipede.

Calippic cycle , a period of 76 years, or four Metonic cycles; -- so called from Calippus, who proposed it as an improvement on the Metonic cycle. -- Cycle of eclipses , a period of about 6,586 days, the time of revolution of the moon's node; -- called Saros by the Chaldeans. -- Cycle of indiction , a period of 15 years, employed in Roman and ecclesiastical chronology, not founded on any astronomical period, but having reference to certain judicial acts which took place at stated epochs under the Greek emperors. -- Cycle of the moon , or Metonic cycle , a period of 19 years, after the lapse of which the new and full moon returns to the same day of the year; -- so called from Meton, who first proposed it. -- Cycle of the sun , Solar cycle , a period of 28 years, at the end of which time the days of the month return to the same days of the week. The dominical or Sunday letter follows the same order; hence the solar cycle is also called the cycle of the Sunday letter . In the Gregorian calendar the solar cycle is in general interrupted at the end of the century.

Cycle intransitive verb [ imperfect & past participle Cycled . (-k'ld); present participle & verbal noun Cycling (-kl...ng).]
1. To pass through a cycle of changes; to recur in cycles. Tennyson. Darwin.

2. To ride a bicycle, tricycle, or other form of cycle.

Cycle noun (a) (Thermodynamics) A series of operations in which heat is imparted to (or taken away from) a working substance which by its expansion gives up a part of its internal energy in the form of mechanical work (or being compressed increases its internal energy) and is again brought back to its original state. (b) (Electricity) A complete positive and negative wave of an alternating current; one period. The number of cycles (per second) is a measure of the frequency of an alternating current.

Cyclic (s?k"l?k or s?"kl?k), Cyc"lic*al (s?k"l?-k a l) adjective [ Confer French cycluque , Greek kykliko`s , from ky`klos See Cycle .] Of or pertaining to a cycle or circle; moving in cycles; as, cyclical time. Coleridge.

Cyclic chorus , the chorus which performed the songs and dances of the dithyrambic odes at Athens, dancing round the altar of Bacchus in a circle. -- Cyclic poets , certain epic poets who followed Homer, and wrote merely on the Trojan war and its heroes; -- so called because keeping within the circle of a single subject. Also, any series or coterie of poets writing on one subject. Milman.

Cyclide noun [ Greek ky`klos circle.] (Geom.) A surface of the fourth degree, having certain special relations to spherical surfaces. The tore or anchor ring is one of the cyclides.

Cycling noun The act, art, or practice, of riding a cycle, esp. a bicycle or tricycle.

Cyclist noun A cycler.

Cyclo- (s?"kl?-). [ Greek ky`klos circle, wheel.] A combining form meaning circular , of a circle or wheel .

Cyclobranchiate adjective [ Cyclo- + branchiate .] (Zoöl) Having the gills around the margin of the body, as certain limpets.

Cycloganoid adjective (Zoology) Of or pertaining to the Cycloganoidei.

Cycloganoid noun (Zoology) One of the Cycloganoidei.

Cycloganoidei noun plural [ New Latin , from Greek ky`klos circle + New Latin ganoidei . See Ganoid .] (Zoology) An order of ganoid fishes, having cycloid scales. The bowfin ( Amia calva ) is a living example.

Cyclograph noun [ Cyclo- + -graph .] See Arcograph .

Cycloid noun [ Cyclo- + -oid : confer French cycloïde .] (Geom.) A curve generated by a point in the plane of a circle when the circle is rolled along a straight line, keeping always in the same plane.

» The common cycloid is the curve described when the generating point ( p ) is on the circumference of the generating circle; the curtate cycloid , when that point lies without the circumference; the prolate or inflected cycloid , when the generating point ( p ) lies within that circumference.

Cycloid adjective (Zoology) Of or pertaining to the Cycloidei.

Cycloid scale (Zoology) , a fish scale which is thin and shows concentric lines of growth, without serrations on the margin.

Cycloid noun (Zoology) One of the Cycloidei.

Cycloidal (- a l) adjective Pertaining to, or resembling, a cycloid; as, the cycloidal space is the space contained between a cycloid and its base.

Cycloidal engine . See Geometric lathe .

Cycloidei noun plural [ New Latin , from Greek ky`klos circle + - oid .] (Zoology) An order of fishes, formerly proposed by Agassiz, for those with thin, smooth scales, destitute of marginal spines, as the herring and salmon. The group is now regarded as artificial.

Cycloidian adjective & noun (Zoology) Same as 2d and 3d Cycloid .

Cyclometer noun [ Cyclo- + -meter .] A contrivance for recording the revolutions of a wheel, as of a bicycle.

Cyclometry noun [ Cyclo- + -metry : confer French cyclométrie .] (Geom.) The art of measuring circles.

Cyclone noun [ Greek ............... moving in a circle, present participle of ..............., from ky`klos circle.] (Meteor.) A violent storm, often of vast extent, characterized by high winds rotating about a calm center of low atmospheric pressure. This center moves onward, often with a velocity of twenty or thirty miles an hour.

» The atmospheric disturbance usually accompanying a cyclone, marked by an onward moving area of high pressure, is called an anticyclone .

Cyclone noun
1. (Meteor.) In general, a condition of the atmosphere characterized by a central area of pressure much lower than that of surrounding areas, and a system of winds blowing inward and around (clockwise in the southern hemisphere and counter-clockwise in the northern); -- called also a low-area storm . It is attended by high temperature, moist air, abundant precipitation, and clouded sky. The term includes the hurricane, typhoon, and tropical storms; it should not be applied to the moderate disturbances attending ordinary areas of low pressure nor to tornadoes, waterspouts, or "twisters," in which the vertical motion is more important than the horizontal.

2. A tornado. See above, and Tornado . [ Middle U. S.]

Cyclone cellar, pit A cellar or excavation used for refuge from a cyclone, or tornado. [ Middle U. S.]

Cyclonic adjective Pertaining to a cyclone.

Cyclonoscope noun [ Cyclone + -scope .] An apparatus to assist in locating the center of a cyclone.