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There are 4 twelve-letter words beginning with URO

UROBILINOGEN• urobilinogen 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.
UROCHORDATES• urochordates n. Plural of urochordate.
• UROCHORDATE n. a member of the Urochordata, tunicates.
UROLITHIASES• urolithiases n. Plural of urolithiasis.
• UROLITHIASIS n. formation of kidney stones.
UROLITHIASIS• urolithiasis 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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