The definition of a deuteragonist is the second most important character after the protagonist.
(noun)An example of a deuteragonist is a superhero's leading lady.
See deuteragonist in Webster's New World College Dictionary
noun
Origin: Gr deuteragōnistēs: see deutero- & agonize & -ist
See deuteragonist in American Heritage Dictionary 4
noun
Origin:
Origin: Greek deuteragōnistēs, an actor of second-class parts
Origin: : deuteros, second; see deu-1 in Indo-European roots
Origin: + agōnistēs, actor; see protagonist
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