词根词缀：rid-, ridi-, risi-

【来源及含义】Latin: to laugh, laugh at; capable of exciting laughter; laughing

【同源单词】deride, derider, deridingly, derision, derisive, derisively

词根词缀：rigi-, rig-

【来源及含义】Latin: stiff, hard, numb; to be frozen, to grow stiff with cold, to be chilled

【同源单词】acid rigor, calcium rigor, catatonic rigidity, cerebellar rigidity, clasp-knife rigidity, cogwheel rigidity

词根词缀：rim-

【来源及含义】Latin: crack, chink

【同源单词】rima, rima glottidis, rima oris, rima vestibuli, rimal, rimose

词根词缀：ripari-, ripa-, rip-, riv-

【来源及含义】Latin: ripa, river, stream; bank, river bank, shore

【相关词根词缀】 Cross references of word families that are related directly, or indirectly, to: "river, stream": amni-; fluvio-; meand-; oceano-; potamo-.

【同源单词】aeroderivative, arrival, arrive, arrived, derivable, derivation

词根词缀：rit-, ritual-

【来源及含义】Latin: ritus, religious observance or ceremony; custom, usage

【同源单词】rite, ritual, ritualism, ritualist, ritualistic, ritualistically

词根词缀：robor-, robust-

【来源及含义】Latin: strengthening; to strengthen, to invigorate; strength

【同源单词】corroborant, corroborate, corroborating, corroboration, corroborative, corroboratively

词根词缀：rod-, ros-

【来源及含义】Latin: gnaw, eat away; eaten away, gnawed off, consumed

【同源单词】corrode, corrodible, corrosion, corrosive, erode, eroded

词根词缀：roentgeno-, roentgen-

【来源及含义】German: radiation, "x-ray"; X-ray; 1896, translation of German X-strahl, from X, "algebraic symbol for an unknown quantity", + Strahl, "beam, ray"

【相关描述】So called after its discoverer, a German physicist, Wilhelm Konrad Roentgen [1845-1923], who discovered roentgen rays [x-rays] in 1895; winner of the Nobel prize in physics in 1901.

【相关词根词缀】 Related "roentgen, x-ray" units: Roentgen Biography; Chemical Element: roentgenium.

【同源单词】bioroentgenography, cineradiograhy, cineroentgenography, fluororoentgenography, kiloroentgen, microroentgen

词根词缀：rog-, roga-, -rogate, -rogation, -rogatory

【来源及含义】Latin: ask, inquire, request, beg; propose

【同源单词】abrogate, abrogation, arrogance, arrogancy, arrogant, arrogantly

词根词缀：roma-

【来源及含义】Latin: Rome

【同源单词】Quando hic sum, roam, Roman, Roman Republic, romance, romancer