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nomen rejectum
Besides conservation of a name, the International Code of Botanical Nomenclature (ICBN) also offers the option of rejection of a name, creating a nomen rejectum (rejected name) that cannot be used anymore. Rejection is possible for a name at any rank.
This entry is located in the following units:
jet-, -ject, -jecting, -jected, -jection, -jector, -jectory; jacu-, jac-
(page 5)
nom-, nomen-, nomin-, -nomia, -nomic
(page 3)