offshore structure A fixed (for the duration of the measurements) man-made structure away from the coast to which instrumentation may be attached (e.g. oil rig, gas rig or jack-up barge). 2013-08-20 13:53:41.0 SDN:L06::16 SDN:L06::16 SDN:L06::16 3 3 2013-08-20 13:53:41.0 accepted false