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usually uncountable, plural urines
(physiology) Liquid waste consisting of water, salts, and urea, which is made in the kidneys, stored in the bladder, then released through the urethra. quotations
An artificial kidney these days still means a refrigerator-sized dialysis machine. Such devices mimic the way real kidneys cleanse blood and eject impurities and surplus water as urine.
2013 June 1, “A better waterworks”, in The Economist, volume 407, number 8838, page 5 (Technology Quarterly)
third-person singular simple present urines, present participle urining, simple past and past participle urined
(archaic) To urinate. quotations
He got out of bed every time he urined, or tried to urine.
1814, The Medical and Physical Journal, volume 31, page 226