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rhodopsin the red, light-sensitive protein pigment that is present in the retina of the eye and provides vision in dim light.
rhombencephalon the embryonic hindbrain, from which the cerebellum, pons, and medulla oblongata develop.
rhombic in the form of a rhombus. [4 definitions]
rhombohedron a six-sided solid figure with a rhombus on each face.
rhomboid a parallelogram in which the opposite sides are equal, the adjacent sides are unequal, and the angles are oblique. [2 definitions]
rhomboideus either of two muscles that connect the vertebrae in the upper back to the shoulder blades.
rhombus an oblique-angled parallelogram in which all four sides are equal.
Rh positive having the Rh factor in the red blood cells.
rhubarb a cultivated plant with long green or reddish leaf stalks, which are often cooked with sugar and eaten like a fruit.
rhumb see rhumb line. [2 definitions]
rhumba variant of rumba.
rhumb line the curved line on the surface of a sphere, indicating the path of a ship or plane that maintains a fixed compass direction, which crosses all meridians on a globe or map at the same angle.
rhyme a word that ends with the same vowel sound or vowel and consonant combination as another word beginning with a different sound or cluster of sounds. [9 definitions]
rhyme or reason apparent sense or logic.
rhyme royal a seven-line poetic stanza in iambic pentameter, in which the first line rhymes with the third, the second with the fourth and fifth, and the last two with each other.
rhyme scheme the rhyming pattern of the end rhymes of a poem, usu. indicated by letters to show which lines rhyme.
rhymester a poet of inferior or light verse.
rhyming slang a form of language play in which one word or phrase is replaced with another that rhymes with the intended one, such as "trouble and strife" for "wife".
rhyolite a fine-grained, volcanic rock that is similar to granite in composition and has a high silica content.
rhythm movement marked by the regular repetition of accent, beat, or the like. [5 definitions]
rhythm-and-blues a kind of popular American music, developed mostly by blacks, that combines blues and jazz, is characterized by a strong beat, and was a precursor of rock-'n'-roll.