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There are 4 twelve-letter words beginning with URO

UROBILINOGENurobilinogen n. (Biochemistry) A colourless product of bilirubin reduction, formed in the intestines by bacterial action.
UROBILINOGEN n. any of a group of colourless tetrapyrrole compounds produced by the reduction of bilirubin.
UROCHORDATESurochordates n. Plural of urochordate.
UROCHORDATE n. a member of the Urochordata, tunicates.
UROLITHIASESurolithiases n. Plural of urolithiasis.
UROLITHIASIS n. formation of kidney stones.
UROLITHIASISurolithiasis n. (Biology, medicine) Formation of, and thus also presence of, calculi in the urinary tract.
UROLITHIASIS n. formation of kidney stones.

Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.
Definitions are short excerpt from the WikWik.org and 1Word.ws.

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