| ROC | small slow-growing upland pine of western United States (Rocky Mountains) having dense branches with fissured rust-brown bark and short needles in bunches of 5 and thorn-tipped cone scales |
|---|---|
| ROC | North American plant similar to common dogbane |
| ROC | sure-footed mammal of mountainous northwestern North America |
| ROC | a Canada jay with a white head |
| ROC | a national park in Colorado having mountains and lakes and streams and forests |
| ROC | small compact 2-needled pinon of southwestern United States |
| ROC | wild sheep of mountainous regions of western North America having massive curled horns |
| ROC | caused by rickettsial bacteria and transmitted by wood ticks |
| ROC | whitefish of the western United States and Canada |
| ROC | the chief mountain range of western North America |
| ROC | dwarf ornamental shrub of western United States having large black to red and yellow sweet edible fruit |
| ROC | small maple of northwestern North America |