Definition of ros:
(n) :
A diminutive of the female given name Rosalind.
(n) :
A diminutive of the female given name Rosamund.
(n) :
Abbreviation of reactive oxygen species. [(chemistry) Any peroxide, singlet oxygen or similar material that is a reactive oxidizing agent.]
(n) :
(singular only) Abbreviation of Robot Operating System, a robotic middleware.
(n) :
(ISS, space science, US) Initialism of Russian Orbital Segment, the part of the International Space Station that was contributed by Russia, or using ROSCOSMOS/Mir specification-based modules.
(n) :
(plural only) Initialism of rights of survivorship.