9-letter words containing o, r, a, i
- rheobasic — of or relating to rheobase
- rheotaxis — oriented movement of an organism in response to a current of fluid, especially water.
- rhizobial — of or relating to rhizobium
- rhizocarp — a plant that fruits underground or whose root remains intact while the leaves die off annually
- rhizocaul — a rootlike stem or stalk
- rhodamine — a red dye obtained by heating an alkyl aminophenol with phthalic anhydride.
- rhodanize — to plate with rhodium
- rhodesian — (as Southern Rhodesia, ) a former British colony in S Africa: declared independence 1965; name changed to Zimbabwe, 1979.
- rhoeadine — a chemical compound found in the red poppy which has similar effects to those of opium
- rhopalism — the art, skill, or incidence of writing rhopalic verse
- rhotacism — Historical Linguistics. a change of a speech sound, especially (s), to (r), as in the change from Old Latin lases to Latin lares.
- rhotacize — to change (a sound) to an (r); subject to rhotacism.
- rib roast — a cut of beef taken from the small end of the ribs and containing a large rib eye and two or more ribs.
- ribozymal — of or relating to ribozymes
- rice coal — anthracite coal in sizes ranging from 3/16 to 5/16 inch (about 0.5 to 0.8 cm).
- rigmarole — an elaborate or complicated procedure: to go through the rigmarole of a formal dinner.
- ring road — motorway around a city
- rio bravo — Mexican name of Rio Grande (def 1).
- rio claro — a city in São Paulo state, in SE Brazil.
- riot gear — Riot gear is the special clothing and equipment worn by police officers or soldiers when they have to deal with a riot.
- ritonavir — a type of anti-viral drug used to treat HIV infection and AIDS
- rivalrous — characterized by rivalry; competitive: the rivalrous aspect of their friendship.
- riverboat — any shallow-draft boat used on rivers.
- road bike — a bike designed to be ridden on roads, as opposed to a mountain bike
- road kill — Informal. the body of an animal killed on a road by a motor vehicle.
- road sign — traffic notice
- road trip — journey in a car, bus, etc.
- rocinante — Rosinante.
- rodgersia — a type of flowering plant which grows in shady and moist conditions
- rogations — solemn supplications, esp in a form of ceremony prescribed by the Church
- roid rage — angry and aggressive behaviour caused by the use of anabolic steroids
- rollatini — a dish consisting of thin slices of poultry or meat rolled around a filling, especially of ham and cheese, and baked in a sauce.
- romanised — to make Roman Catholic.
- root hair — an elongated tubular extension of an epidermal cell of a root, serving to absorb water and minerals from the soil.
- rosemarie — a female given name.
- rosinante — the old, worn horse of Don Quixote.
- rotavirus — a double-stranded RNA virus of the genus Rotavirus, family Reoviridae, that is a major cause of infant diarrhea.
- rotiferan — relating to the phylum of freshwater invertebrates Rotifera
- roubiliac — Louis-François (lwifrɑ̃swa). ?1695–1762, French sculptor: lived chiefly in England: his sculptures include the statue of Handel in Vauxhall Gardens (1737)
- roumanian — Romania.
- rovaniemi — a city in N Finland, near the Arctic Circle.
- ructation — an eructation or belch
- ruination — the act or state of ruining or the state of being ruined.
- ruminator — to chew the cud, as a ruminant.
- sacciform — resembling a sac
- sail-over — a repetition of an indecisive or interrupted run of a racing yacht.
- sailboard — a long board, usually of Plexiglas, used for windsurfing, having a mount for a sail, a daggerboard, and a small skeg.
- sailoring — the occupation or duties of a sailor.
- salivator — any agent that causes salivation.
- sanatoria — a hospital for the treatment of chronic diseases, as tuberculosis or various nervous or mental disorders.