Ros

1. A diminutive of the female given name Rosalind.
2. A diminutive of the female given name Rosamund.

1. USabbreviationinitialismspaceInitialism of Russian Orbital Segment, the part of the International Space Station that was contributed by Russia, or using ROSCOSMOS/Mir specification-based modules.
2. abbreviationAbbreviation of Robot Operating System (“a kind of robotic middleware”).

plural ROSs

1. abbreviationcountableuncountableAbbreviation of reactive oxygen species.

   O₂^(•−) and OH^• are highly unstable (half-life at the level of microseconds and nanoseconds, respectively) and cannot cross membrane, while H₂O₂, though not a free radical but a ROS, is relatively stable (half-life around 1 ms) (Møller et al. 2007) and can cross membranes through aquaporins.

   2015, Rup Kumar Kar, “ROS Signaling: Relevance with Site of Production and Metabolism of ROS”, in Dharmendra K. Gupta, José M. Palma, Francisco J. Corpas, editors, Reactive Oxygen Species and Oxidative Damage in Plants Under Stress, Springer, →ISBN, page 117

   1 more example

   Either way, a set of antioxidants worked to reduce the levels of ROS, and the [fruit] flies could live to the ripe old age of 40 days… if not a teensy bit longer! But most importantly, this demonstrated that the death from lack of sleep was not only correlated with the production of ROS, but caused by it.

   2024 November 11, Stephanie Caty, 10:29 from the start, in How Not Sleeping Actually Kills You, spoken by Stefan Chin, SciShow, via YouTube

2. abbreviationcountableinitialismpluralplural onlyuncountableInitialism of rights of survivorship.

   Synonyms: JWROS

3. abbreviationcountableinitialismuncountablebroadcastingInitialism of run of station.

1. abbreviationinitialismInitialism of Registers of Scotland.