rariconstantOf or relating to a theory of Augustin-Louis Cauchy according to which a single elastic constant is sufficient to describe an isotropic material.
rarissimaExtremely rare books, manuscripts, or prints.
RaritanA member of either of two groups of Lenape people who lived around the lower Raritan River and the Raritan Bay, in what is now northeastern New Jersey, in the 16th century.
rasaAn essential mental state; the dominant emotional theme of a work.
rasaboxOne of a set of labelled boxes in a diagram drawn on the floor, each representing an emotion or facet of a character, used in training actors to play a part.
rasagilineAn inhibitor of monoamine oxidase used as a monotherapy in early Parkinson's disease or as an adjunct therapy in more advanced cases.
RasalasMu Leonis, a star in the constellation of Leo.
RasalgethiAlpha Herculis A, a component of Alpha Herculis, a multiple star system in the constellation of Hercules.
RasalhagueAlpha Ophiuchi, a binary star and the brightest star in the constellation of Ophiuchus.
rasamA spicy South Indian soup made with tamarind juice.
rasanteSweeping; grazing; applied to a style of fortification in which the command of the works over each other, and over the country, is kept very low, so that the shot may more effectually sweep or graze the ground before them
rasavalliA tropical plant of the species Dioscorea alata, cultivated for its edible root.
rasboraAny minnow-like small fish in the cyprinid genus Rasbora.
rasborinAny member of the Rasbora genus of fishes, or similar (Trigonostigma and Boraras).
rasburicaseA recombinant version of a urate oxidase enzyme that occurs in many mammals but not in humans, used in treating certain tumour-related conditions.
rascacioThe black scorpionfish (Scorpaena porcus).
raseTo be extremely angry; to rage; specifically, of a dog or wolf: to snarl in rage.
raseglurantA drug developed to treat migraine, gastroesophageal reflux disease, and dental anxiety, but discontinued because of possible predictive signs of hepatotoxicity.
RaseiniaiA city and district municipality of Kaunas, Lithuania.
rashguardSynonym of rash vest (“a close-fitting garment often worn while surfing or during other water sports under a wetsuit to prevent chafing and provide UV protection or extra warmth”).
rashia single piece of Rashi's commentary on the Hebrew Bible or Talmud
RashtA city in Iran, the seat of Rasht County's Central District and the capital of Gilan Province, located on the southwestern shore of the Caspian Sea.
raskolA criminal in Papua New Guinea, sometimes operating as part of a gang.
RaskolnikAny of those who separated from the official Russian Orthodox Church after 1666 as a protest against church reforms introduced by Patriarch Nikon between 1652 and 1666.
RaskolnikovianOf or relating to Rodion Romanovich Raskolnikov (Russian: Родиóн Ромáнович Раскóльников), fictional protagonist of Crime and Punishment by Fyodor Dostoyevsky.
raslakiteA trigonal-ditrigonal pyramidal brownish red mineral containing calcium, chlorine, hydrogen, iron, niobium, oxygen, silicon, sodium, and zirconium.
rasmThe base shape of an Arabic-script letter, without dots that distinguish it from other letters.
RasmussenA surname from Danish [in turn originating as a patronymic] of Danish and Norwegian origin.