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stellar systems
plural of stellar system
organ systems
plural of organ system
organ system
(biology) A group of organs that work together as a biological system to perform one or more functions.
staff system
(rail transport, historical) A block system in use on single-line railways, in which the stationmaster gives the driver a staff authorizing the driver to proceed over a given portion of track.
staff systems
plural of staff system
hire system
purchase system
(UK, historical) The practice, abolished in 1871, of paying money to be made an officer in the cavalry and infantry regiments of the English and later British Army, without having to wait for promotion.
aquiferous system
(zoology) The system of connected water channels that is unique to sponges (Porifera). / (zoology, dated) The hydrostatic skeleton of certain marine gastropods.