| rhinovirus |
any of a large group of related RNA viruses that cause respiratory diseases, esp. the common cold. |
| rhizo- |
root. |
| rhizobium |
any of various soil bacteria that live in a symbiotic relationship with legume plants by forming nodules on the roots and converting atmospheric nitrogen into a form the plants can use. |
| rhizoid |
rootlike. [2 definitions] |
| rhizome |
an underground horizontal or compressed stem that bears shoots along its upper surface. |
| rhizopod |
a protozoan such as the amoeba that moves and takes in food by means of pseudopodia. |
| Rh negative |
lacking the Rh factor in the red blood cells. |
| rho |
the name of the seventeenth letter of the Greek alphabet. |
| Rhode Island |
a New England state on the Atlantic coast between Connecticut and Massachusetts. (abbr.: RI) |
| Rhode Island Red |
any of an American breed of chicken with dark reddish brown feathers, that produces brown eggs. |
| Rhode Island White |
any of an American breed of chicken with white feathers and a red comb. |
| Rhodes grass |
an African creeping grass grown for forage in the southern United States. |
| Rhodesia |
Southern Rhodesia, the former name of Zimbabwe. [2 definitions] |
| Rhodesian man |
an extinct primitive man of the late Pleistocene Era, whose skeletal remains, found in southern Africa, are similar to modern man except for a large skull and low, massive brow ridges. |
| Rhodesian ridge-back |
a large, muscular breed of hunting dog developed in southern Africa that has a tan or tannish red coat and a ridge along the spine formed by the hairs growing forward rather than with the rest of the coat. |
| Rhodes scholarship |
any of a number of scholarships at Oxford University in England, established for selected British Commonwealth and U.S. students. |
| rhodium |
a chemical element that has forty-five protons in each nucleus and that occurs in pure form as a silvery-white, very corrosion-resistant metal, used esp. to electroplate instruments and jewelry and as a catalyst. (symbol: Rh) |
| rhodo- |
rose. |
| rhodochrosite |
a rose-pink, brown, or gray mineral composed of manganese carbonate that typically occurs as rhombohedral crystals and is important commercially as a source of manganese. |
| rhododendron |
any of various shrubs or trees with leathery evergreen leaves and clusters of bright pink, red, purple, white, or yellow flowers. |
| rhodolite |
a pink, rose-red, or reddish violet variety of garnet, used as a gemstone. |