To name jointly; to give a name to something together with others, or to be named in association with someone or something.
From the prefix co- meaning 'together' plus named, the past tense of name. This is a modern English construction combining the collaborative prefix with the standard verb for naming.
Many discoveries in science involve conamed discoveries—think of how diseases often get named after multiple scientists ('Crohn-Ginzburg disease')—which sometimes causes bitter fights over who gets credit!
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