"Uredinium" Natural Recordings by Native Speakers
Uredinium is a rare or obsolete word.
It is an archaic or obsolete term for a reddish-yellow to brownish-yellow pigment, a variety of urane.
However, more relevantly, it can be considered as a misspelling of the word "uredinum" which is not present in mainstream dictionaries.
But based on the suffix "-inum" it might relates to Urea, and thus, derived from Uredinium we might assign it to be related to an "urea" or "urea-like" compound.
However, we cannot assign an exact meaning directly as it is not widely recognized.
Urecholine is a neuromuscular blocking agent, one of the muscarinic agonists, which acts as a cholinergic agonist. It is derived from muscle chaconine.