| rhodolite |
a pink, rose-red, or reddish violet variety of garnet, used as a gemstone. |
| 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] |