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There are 17 twelve-letter words beginning with RI

RIBBONFISHESribbonfishes n. Plural of ribbonfish.
RIBBONFISH n. a long slender fish, the oarfish.
RIBOFLAVINESRIBOFLAVINE n. a member of the vitamin B complex, in yellowish-brown crystals, promoting growth in children, also RIBOFLAVIN.
RIBONUCLEASEribonuclease n. (Biochemistry) Any of a group of enzymes that catalyze the hydrolysis of ribonucleic acid.
RIBONUCLEASE n. an enzyme that catalyzes the hydrolysis of RNA.
RICOCHETTINGricochetting v. Present participle of ricochet.
RICOCHET v. (French) to rebound from a surface.
RIDABILITIESRIDABILITY n. the state of being ridable.
RIDESHARINGSRIDESHARING n. the practice of sharing a car with other commuters as a means of lessening traffic congestion or pollution.
RIDICULOUSLYridiculously adv. In a ridiculous manner. In a way that is funny, embarrassing or extremely implausible.
ridiculously adv. (Degree) extremely; very.
RIDICULOUS adv. arousing or deserving ridicule.
RIFACIMENTOSrifacimentos n. Plural of rifacimento.
RIFACIMENTO n. (Italian) a recasting of a literary or musical work.
RIGHTFULNESSrightfulness n. The state or quality of being rightful.
RIGHTFULNESS n. the state of being rightful.
RIGHTSIZINGSRIGHTSIZING n. the act of adapting an organisation to an appropriate size by means of redundancies.
RIGOROUSNESSrigorousness n. The property of being rigorous, strictness.
RIGOROUSNESS n. the state of being rigorous.
RIJKSDAALERSRIJKSDAALER n. (Dutch) a small Dutch silver coin, also RIGSDALER.
RINTHEREOUTSRINTHEREOUT n. (Scots) a vagrant.
RISIBILITIESrisibilities n. Plural of risibility.
RISIBILITY n. the quality of being risible.
RISORGIMENTORisorgimento prop.n. (Historical) The political and military movement that led to the unification of Italy in the 19th century.
Risorgimento prop.n. Renewal, revival, renaissance.
RISORGIMENTO n. (Italian) a time of renewal or renaissance; specifically, the 19th century movement for Italian political unity.
RISPERIDONESSorry, definition not available.
RITOURNELLESRITOURNELLE n. (French) a short instrumental passage in a vocal work, also RITORNEL, RITORNELL, RITORNELLE, RITORNELLO.

Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.
Definitions are short excerpt from the 1Word.ws and WikWik.org.

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