| ROS | any of various western American plants of the genus Grindelia having resinous leaves and stems formerly used medicinally |
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| ROS | North American perennial having a resinous odor and yellow flowers |
| ROS | erect plant with small clusters of pink trumpet-shaped flowers of southwestern United States |
| ROS | rosemary |
| ROS | widely cultivated for its fragrant gray-green leaves used in cooking and in perfumery |
| ROS | American seamstress said to have made the first American flag at the request of George Washington (1752-1836) |
| ROS | a politician in Wyoming who was the first woman governor in the United States (1876-1977) |
| ROS | British physician who discovered that mosquitos transmit malaria (1857-1932) |
| ROS | British explorer of the Arctic and Antarctic |
| ROS | Scottish explorer who led Arctic expeditions that yielded geographic discoveries while searching for the Northwest Passage (1777-1856) |
| ROS | an arm of the southern Pacific Ocean in Antarctica |
| ROS | a battle in the Seven Years' War (1757) |