The Register was South Australia's first newspaper. The first issue was printed in London in June 1836, and a year later the second issue was printed in a rush hut in Hindley Street in what is now called Register Place.
In intravenous medical use, to register means to pull blood back into the syringe barrel to find, or show that the needle is in, a vein. Registering is also called flagging and blood so seen is called a 'flag' of blood or blood flag.
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