| ridge |
a long narrow natural elevation or striation any long raised strip extend in ridges; "The land ridges towards the South" plough alternate strips by throwing the furrow onto an unploughed strip a long narrow range of hills throw soil toward (a crop row) from both sides; "He ridged his corn" spade into alternate ridges and troughs; "ridge the soil" any long raised border or margin of a bone or tooth or membrane form into a ridge a beam laid along the edge where two sloping sides of a roof meet at the top; provides an attachment for the upper ends of rafters
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| Ricinus |
a genus of herb having only one known species: castor-oil plant
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| Rickettsiaceae |
microorganism resembling bacteria inhabiting arthropod tissues but capable of causing disease in vertebrates
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| Rickettsiales |
pleomorphic Gram-negative microorganisms
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| rictus |
a gaping grimace
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