Webster's Dictionary, 1913

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Rosolic adjective [ Rose + carbo lic .] (Chemistry) Pertaining to, or designating, a complex red dyestuff (called rosolic acid ) which is analogous to rosaniline and aurin. It is produced by oxidizing a mixture of phenol and cresol, as a dark red amorphous mass, C 20 H 16 O 3 , which forms weak salts with bases, and stable ones with acids. Called also methyl aurin , and, formerly, corallin .

Ross ; 115) noun [ Etymol. uncertain.] The rough, scaly matter on the surface of the bark of trees. [ Prov. Eng. & Local, U.S.]

Ross transitive verb To divest of the ross, or rough, scaly surface; as, to ross bark. [ Local, U.S.]

Rossel noun Light land; rosland. [ Obsolete or Prov. Eng.] Mortimer.

Rossel current [ From Rossel Island, in the Louisiade Archipelago.] (Oceanography) A portion of the southern equatorial current flowing westward from the Fiji Islands to New Guinea.
[ Webster 1913 Suppl.]

Rosselly adjective Loose; light. [ Obsolete] Mortimer.

Rost noun See Roust . [ Scot.] Jamieson.

Rostel noun [ Latin rostellum , dim. of rostrum a beak: confer French rostelle .] same as Rostellum .

Rostellar adjective Pertaining to a rostellum.

Rostellate adjective [ New Latin rostellatus .] Having a rostellum, or small beak; terminating in a beak.

Rostelliform adjective Having the form of a rostellum, or small beak.

Rostellum noun ; plural Rostella . [ Latin See Rostel .] A small beaklike process or extension of some part; a small rostrum; as, the rostellum of the stigma of violets, or of the operculum of many mosses; the rostellum on the head of a tapeworm.

Roster noun [ Perhaps a corruption of register ; or confer roll .] (Mil.) A register or roll showing the order in which officers, enlisted men, companies, or regiments are called on to serve.

Rostra noun plural See Rostrum , 2.

Rostral adjective [ Latin rostralis , from rostrum a beak; confer French rostral .] Of or pertaining to the beak or snout of an animal, or the beak of a ship; resembling a rostrum, esp., the rostra at Rome, or their decorations.

[ Monuments] adorned with rostral crowns and naval ornaments.
Addison.

Rostrate, Rostrated adjective [ Latin rostratus , from rostrum a beak. See Rostrum .]
1. Having a process resembling the beak of a bird; beaked; rostellate.

2. Furnished or adorned with beaks; as, rostrated galleys.

Rostrifera noun plural [ New Latin , from Latin rostrum beak + ferre to bear.] (Zoology) A division of pectinibranchiate gastropods, having the head prolonged into a snout which is not retractile.

Rostriform adjective [ Latin rostrum a beak + -form : confer French rostrifarme .] Having the form of a beak.

Rostrulum (-tru*lŭm) noun ; plural Rostrula . [ New Latin , dim. of Latin rostrum a beak.] A little rostrum, or beak, as of an insect.

Rostrum (-trŭm) noun ; plural Latin Rostra , English Rostrums . [ Latin , beak, ship's beak, from rodere , rosum , to gnaw. See Rodent .]
1. The beak or head of a ship.

2. plural ( Rostra ) (Rom. Antiq.) The Beaks; the stage or platform in the forum where orations, pleadings, funeral harangues, etc., were delivered; -- so called because after the Latin war, it was adorned with the beaks of captured vessels; later, applied also to other platforms erected in Rome for the use of public orators.

3. Hence, a stage for public speaking; the pulpit or platform occupied by an orator or public speaker.

Myself will mount the rostrum in his favor.
Addison.

4. (Zoology) (a) Any beaklike prolongation, esp. of the head of an animal, as the beak of birds. (b) The beak, or sucking mouth parts, of Hemiptera. (c) The snout of a gastropod mollusk. See Illust. of Littorina . (d) The anterior, often spinelike, prolongation of the carapace of a crustacean, as in the lobster and the prawn.

5. (Botany) Same as Rostellum .

6. (Old Chem.) The pipe to convey the distilling liquor into its receiver in the common alembic. Quincy.

7. (Surg.) A pair of forceps of various kinds, having a beaklike form. [ Obsolete] Coxe.

Rosulate adjective [ New Latin rosulatus , from Latin rosa a rose.] (Botany) Arranged in little roselike clusters; -- said of leaves and bracts.

Rosy adjective [ Compar. Rosier ; superl. Rosiest .] Resembling a rose in color, form, or qualities; blooming; red; blushing; also, adorned with roses.

A smile that glowed
Celestial rosy -red, love's proper hue.
Milton.

While blooming youth and gay delight
Sit thy rosy cheeks confessed.
Prior.

» Rosy is sometimes used in the formation of self...xplaining compounde; as, rosy -bosomed, rosy - colored, rosy -crowned, rosy -fingered, rosy - tinted.

Rosy cross . See the Note under Rosicrucian , noun

Rot intransitive verb [ imperfect & past participle Rotted ; present participle & verbal noun Rotting .] [ Middle English rotien , Anglo-Saxon rotian ; akin to Dutch rotten , Prov. German rotten , Old High German rozz...n , German rösten to steep flax, Icelandic rotna to rot, Swedish ruttna , Danish raadne , Icelandic rottin rotten. √117. Confer Ret , Rotten .]
1. To undergo a process common to organic substances by which they lose the cohesion of their parts and pass through certain chemical changes, giving off usually in some stages of the process more or less offensive odors; to become decomposed by a natural process; to putrefy; to decay.

Fixed like a plant on his peculiar spot,
To draw nutrition, propagate, and rot .
Pope.

2. Figuratively: To perish slowly; to decay; to die; to become corrupt.

Four of the sufferers were left to rot in irons.
Macaulay.

Rot , poor bachelor, in your club.
Thackeray.

Syn. -- To putrefy; corrupt; decay; spoil.

Rot transitive verb
1. To make putrid; to cause to be wholly or partially decomposed by natural processes; as, to rot vegetable fiber.

2. To expose, as flax, to a process of maceration, etc., for the purpose of separating the fiber; to ret.

Rot noun
1. Process of rotting; decay; putrefaction.

2. (Botany) A disease or decay in fruits, leaves, or wood, supposed to be caused by minute fungi. See Bitter rot , Black rot , etc., below.

3. [ Confer German rotz glanders.] A fatal distemper which attacks sheep and sometimes other animals. It is due to the presence of a parasitic worm in the liver or gall bladder. See 1st Fluke , 2.

His cattle must of rot and murrain die.
Milton.

Bitter rot (Botany) , a disease of apples, caused by the fungus Glæosporium fructigenum . F. Latin Scribner. -- Black rot (Botany) , a disease of grapevines, attacking the leaves and fruit, caused by the fungus Læstadia Bidwellii . F. Latin Scribner. -- Dry rot (Botany) See under Dry . -- Grinder's rot (Medicine) See under Grinder . -- Potato rot . (Botany) See under Potato . -- White rot (Botany) , a disease of grapes, first appearing in whitish pustules on the fruit, caused by the fungus Coniothyrium diplodiella . F. Latin Scribner.

Rota noun [ Latin rota wheel. The name is said to allude to the design of the floor of the room in which the court used to sit, which was that of a wheel. See Rotary .]
1. An ecclesiastical court of Rome, called also Rota Romana , that takes cognizance of suits by appeal. It consists of twelve members.

2. (Eng. Hist.) A short-lived political club established in 1659 by J.Harrington to inculcate the democratic doctrine of election of the principal officers of the state by ballot, and the annual retirement of a portion of Parliament.

Rota noun (Mus.) A species of zither, played like a guitar, used in the Middle Ages in church music; -- written also rotta .

Rotacism noun See Rhotacism .

Rotal adjective Relating to wheels or to rotary motion; rotary. [ R.]

Rotalite noun [ Latin rota wheel + -lite .] (Paleon.) Any fossil foraminifer of the genus Rotalia , abundant in the chalk formation. See Illust. under Rhizopod .

Rotary adjective [ Latin rota a wheel. See Roll , v. , and confer barouche , Rodomontade , Roué , Round , adjective , Rowel .] Turning, as a wheel on its axis; pertaining to, or resembling, the motion of a wheel on its axis; rotatory; as, rotary motion.

Rotary engine , steam engine in which the continuous rotation of the shaft is produced by the direct action of the steam upon rotating devices which serve as pistons, instead of being derived from a reciprocating motion, as in the ordinary engine; a steam turbine; -- called also rotatory engine . -- Rotary pump , a pump in which the fluid is impelled by rotating devices which take the place of reciprocating buckets or pistons. -- Rotary shears , shears, as for cloth, metal, etc., in which revolving sharp-edged or sharp-cornered wheels do the cutting. -- Rotary valve , a valve acting by continuous or partial rotation, as in the four-way cock.

Rotascope noun [ Latin rota a wheel + -scope .] Same as Gyroscope , 1.

Rotate adjective [ Latin rotatus , past participle of rotare to turn round like a wheel, from rota wheel. See Rotary , and confer Roue .] Having the parts spreading out like a wheel; wheel-shaped; as, a rotate spicule or scale; a rotate corolla, i.e. , a monopetalous corolla with a flattish border, and no tube or a very short one.

Rotate intransitive verb [ imperfect & past participle Rotated ; present participle & verbal noun Rotating .]
1. To turn, as a wheel, round an axis; to revolve.

2. To perform any act, function, or operation in turn, to hold office in turn; as, to rotate in office.

Rotate intransitive verb
1. To cause to turn round or revolve, as a wheel around an axle.

2. To cause to succeed in turn; esp., to cause to succeed some one, or to be succeeded by some one, in office. [ Colloq.] "Both, after a brief service, were rotated out of office." Harper's Mag.

Rotated adjective Turned round, as a wheel; also, wheel-shaped; rotate.

Rotation noun [ Latin rotatio : confer French rotation .]
1. The act of turning, as a wheel or a solid body on its axis, as distinguished from the progressive motion of a revolving round another body or a distant point; thus, the daily turning of the earth on its axis is a rotation ; its annual motion round the sun is a revolution .

2. Any return or succesion in a series.

Moment of rotation . See Moment of inertia , under Moment . -- Rotation in office , the practice of changing public officers at frequent intervals by discharges and substitutions. -- Rotation of crops , the practices of cultivating an orderly succession of different crops on the same land.

Rotation adjective Pertaining to, or resulting from, rotation; of the nature of, or characterized by, rotation; as, rotational velocity.

Rotative adjective [ Confer French rotatif .] turning, as a wheel; rotary; rotational.

This high rotative velocity of the sun must cause an equatorial rise of the solar atmosphere.
Siemens.

Rotative engine , a steam engine in which the reciprocating motion of the piston is transformed into a continuous rotary motion, as by means of a connecting rod, a working beam and crank, or an oscillating cylinder.

Rotator noun [ Latin ]
1. (Anat.) that which gives a rotary or rolling motion, as a muscle which partially rotates or turns some part on its axis.

2. (Metal.) A revolving reverberatory furnace.

Rotatoria noun plural [ New Latin ] (Zoology) Same as Rotifera .

Rotatory adjective [ Confer French rotatoire . See Rotate , Rotary .]
1. Turning as on an axis; rotary.

2. Going in a circle; following in rotation or succession; as, rotatory assembles. Burke.

3. (Opt.) Producing rotation of the plane of polarization; as, the rotatory power of bodies on light. See the Note under polarization . Nichol.

Rotatory noun (Zoology) A rotifer. [ R.] Kirby.

Rotche noun (Zoology) A very small arctic sea bird ( Mergulus alle , or Alle alle ) common on both coasts of the Atlantic in winter; -- called also little auk , dovekie , rotch , rotchie , and sea dove .

Rotchet noun (Zoology) The European red gurnard ( Trigla pini ).