What is any one of a series of complex nitrogenous substances regarded as derived from one molecule of urea; as, alloxan is a monureid. [Written also monureide.] called?

monureid — Any one of a series of complex nitrogenous substances regarded as derived from one molecule of urea; as, alloxan is a monureid. [Written also monureide.]. (Webster's 1913.)

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