| ROS | (Judaism) a solemn Jewish fast day celebrated on the 1st or 1st and 2nd of Tishri |
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| ROS | (Judaism) the beginning of each month in the Jewish calendar |
| ROS | the theological doctrine that venerates the rose and the Cross as symbols of Christ's Resurrection and Redemption |
| ROS | a family of dicotyledonous plants |
| ROS | a genus of dicotyledonous plants |
| ROS | a group of trees and shrubs and herbs mostly with polypetalous flowers |
| ROS | a sneezeweed of southwestern United States especially southern California |
| ROS | any of a class of solid or semisolid viscous substances obtained either as exudations from certain plants or prepared by polymerization of simple molecules |
| ROS | rub rosin onto, as of violin bows |
| ROS | a bag filled with rosin |
| ROS | a healthy reddish complexion |
| ROS | a rosy color (especially in the cheeks) taken as a sign of good health |